diff --git a/src/chrome/browser/aboutCertError.css b/src/chrome/browser/aboutCertError.css
index dd64e05..2737e2c 100644
--- a/src/chrome/browser/aboutCertError.css
+++ b/src/chrome/browser/aboutCertError.css
@@ -34,7 +34,7 @@ h2 {
   border: 1px solid #FFBD09; /* pale yellow extracted from yellow passport icon */
   border-radius: 10px;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   background: url("chrome://global/skin/icons/sslWarning.png") left 0 no-repeat -moz-Field;
   background-origin: content-box;
 }
@@ -44,16 +44,16 @@ h2 {
 }
 
 #errorTitle {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 #errorLongContent {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 .expander > button {
-  -moz-padding-start: 20px;
-  -moz-margin-start: -20px;
+  padding-inline-start: 20px;
+  margin-inline-start: -20px;
   background: url("chrome://browser/skin/aboutCertError_sectionExpanded.png") left center no-repeat;
   border: none;
   font: inherit;
diff --git a/src/chrome/browser/aboutPrivateBrowsing.css b/src/chrome/browser/aboutPrivateBrowsing.css
index 5e0b400..1c6d21e 100644
--- a/src/chrome/browser/aboutPrivateBrowsing.css
+++ b/src/chrome/browser/aboutPrivateBrowsing.css
@@ -16,7 +16,7 @@ body.normal > #errorPageContainer {
 }
 
 #startPrivateBrowsingDesc > button {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 #footerDesc > p {
@@ -25,7 +25,7 @@ body.normal > #errorPageContainer {
 
 #moreInfo {
   font-size: 110%; /* to match the value set in chrome://global/skin/netError.css */
-  -moz-padding-start: 25px;
+  padding-inline-start: 25px;
   background: url("chrome://global/skin/icons/information-16.png") no-repeat top left;
 }
 
diff --git a/src/chrome/browser/aboutSyncTabs.css b/src/chrome/browser/aboutSyncTabs.css
index 0d58443..9276ac6 100644
--- a/src/chrome/browser/aboutSyncTabs.css
+++ b/src/chrome/browser/aboutSyncTabs.css
@@ -26,19 +26,19 @@
   margin-top: 4px;
   width: 48em;
   height: 48px;
-  -moz-margin-start: 2em;
-  -moz-margin-end: 2em;
+  margin-inline-start: 2em;
+  margin-inline-end: 2em;
 }
 
 #tabsListHeading {
   font-size: 140%;
   font-weight: bold;
-  -moz-margin-start: 56px;
+  margin-inline-start: 56px;
   color: #003366;
 }
 
 richlistitem {
-  -moz-margin-end: 2em;
+  margin-inline-end: 2em;
 }
 
 richlistitem[selected="true"],
@@ -51,7 +51,7 @@ richlistitem[type="tab"] {
   border: #7DA2CE 1px solid;
   padding: 2px 5px;
   margin-bottom: 4px;
-  -moz-margin-start: 3em;
+  margin-inline-start: 3em;
   border-radius: 5px;
   background: transparent
               linear-gradient(#FFFFFF, #F6FAFE 51%,
@@ -72,7 +72,7 @@ richlistitem[type="tab"][selected="true"] {
 richlistitem[type="client"] {
   min-height: 2em;
   color: #000000;
-  -moz-margin-start: 2em;
+  margin-inline-start: 2em;
   margin-top: 2px;
   margin-bottom: 3px;
   width: 42em;
@@ -103,6 +103,6 @@ richlistitem.desktop[type="client"] {
 }
 
 .tabIcon {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
   padding-top: 2px;
 }
diff --git a/src/chrome/browser/browser.css b/src/chrome/browser/browser.css
index 116eaab..906fa09 100644
--- a/src/chrome/browser/browser.css
+++ b/src/chrome/browser/browser.css
@@ -111,8 +111,8 @@
 }
 
 #navigator-toolbox > toolbar {
-  -moz-padding-start: 3px;
-  -moz-padding-end: 3px;
+  padding-inline-start: 3px;
+  padding-inline-end: 3px;
 }
 
 #navigator-toolbox > toolbar:not(:-moz-lwtheme) {
@@ -205,8 +205,8 @@
 /* ::::: app menu button ::::: */
 
 .splitmenu-menuitem {
-  -moz-margin-end: 1px;
-  -moz-padding-end: 0.5em;
+  margin-inline-end: 1px;
+  padding-inline-end: 0.5em;
 }
 
 .splitmenu-menu {
@@ -331,18 +331,18 @@
 }
 
 .splitmenu-menu .menu-right {
-  -moz-margin-end: -2px;
+  margin-inline-end: -2px;
 }
 
 .splitmenu-menuitem {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 .splitmenu-menu {
-  -moz-margin-start: -2px;
+  margin-inline-start: -2px;
   background: url("chrome://global/skin/icons/menu_item_split_arrow_bg.png") no-repeat left top;
 }
 .splitmenu-menu:-moz-locale-dir(rtl) {
-  -moz-margin-start: -2px;
+  margin-inline-start: -2px;
   background: url("chrome://global/skin/icons/menu_item_split_arrow_bg2.png") no-repeat right top;
 }
 .splitmenu-menuitem:-moz-locale-dir(ltr),
@@ -414,8 +414,8 @@
 /* ::::: bookmark buttons ::::: */
 
 toolbarbutton.bookmark-item {
-  -moz-margin-start: 1px !important;
-  -moz-margin-end: 1px !important;
+  margin-inline-start: 1px !important;
+  margin-inline-end: 1px !important;
 }
 
 #PersonalToolbar .toolbarbutton-1[type="menu-button"] > .toolbarbutton-menubutton-button,
@@ -461,8 +461,8 @@ toolbarbutton.bookmark-item {
 }
 
 .bookmark-item:not(#bookmarks-menu-button) > .toolbarbutton-icon {
-  -moz-margin-start: 2px !important;
-  -moz-margin-end: 2px !important;
+  margin-inline-start: 2px !important;
+  margin-inline-end: 2px !important;
   width: 16px;
   height: 16px;
 }
@@ -509,7 +509,7 @@ menuitem.bookmark-item {
 }
 
 .bookmark-item > .menu-iconic-left > .menu-iconic-icon {
-  -moz-padding-start: 0px;
+  padding-inline-start: 0px;
 }
 
 /* ::::: bookmark items ::::: */
@@ -585,19 +585,19 @@ toolbar[mode=full] .toolbarbutton-1:not([type=menu-button]) {
 }
 
 #navigator-toolbox > toolbar:not(#TabsToolbar) toolbarbutton[type="menu-button"] > .toolbarbutton-menubutton-button {
-  -moz-padding-start: 2px !important;
-  -moz-padding-end: 2px !important;
+  padding-inline-start: 2px !important;
+  padding-inline-end: 2px !important;
 }
 
 #navigator-toolbox > toolbar:not(#TabsToolbar) toolbarbutton[type="menu-button"] > .toolbarbutton-menubutton-dropmarker {
-  -moz-padding-start: 1px !important;
-  -moz-padding-end: 0px !important;
+  padding-inline-start: 1px !important;
+  padding-inline-end: 0px !important;
 }
 
 #PersonalToolbar > .toolbarbutton-1 {
   margin: -1px 1px 2px 1px;
-  -moz-padding-start: 3px; 
-  -moz-padding-end: 3px;
+  padding-inline-start: 3px; 
+  padding-inline-end: 3px;
 }
 
 .toolbarbutton-1[disabled="true"] > .toolbarbutton-icon,
@@ -636,7 +636,7 @@ toolbar:not(#toolbar-menubar):not(#TabsToolbar):not(#PersonalToolbar):not(#addon
 }
 
 .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
-  -moz-border-start-style: none;
+  border-inline-start-style: none;
 }
 
 .toolbarbutton-1 > .toolbarbutton-menubutton-button:-moz-locale-dir(rtl),
@@ -705,7 +705,7 @@ toolbar:not(#toolbar-menubar):not(#TabsToolbar):not(#PersonalToolbar):not(#addon
 
 .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon,
 .toolbarbutton-1 > .toolbarbutton-icon {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 toolbar[mode=full] .toolbarbutton-1,
@@ -999,8 +999,8 @@ toolbar[brighttext] .toolbarbutton-menubutton-dropmarker {
 }
 
 window:not([chromehidden~=toolbar]) :-moz-any(#nav-bar[currentset*="unified-back-forward-button,urlbar-container"][mode=icons], #nav-bar:not([currentset])[mode=icons]) > #unified-back-forward-button + #urlbar-container {
-  -moz-padding-start: 24px !important;
-  -moz-margin-start: -24px !important;
+  padding-inline-start: 24px !important;
+  margin-inline-start: -24px !important;
   position: relative;
   pointer-events: none;
 }
@@ -1041,27 +1041,27 @@ window:not([chromehidden~=toolbar]) :-moz-any(#nav-bar[currentset*="unified-back
 
 #urlbar-search-splitter {
   min-width: 6px;
-  -moz-margin-start: -3px;
+  margin-inline-start: -3px;
   border-style: none !important;
   background:  transparent !important;
 }
 
 #urlbar-search-splitter + #urlbar-container > #urlbar ,
 #urlbar-search-splitter + #search-container > #searchbar > .searchbar-textbox {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 #urlbar-display-box {
   margin-top: -2px;
   margin-bottom: -2px;
-  -moz-border-end: 1px solid #AAA;
-  -moz-margin-end: 3px;
+  border-inline-end: 1px solid #AAA;
+  margin-inline-end: 3px;
 }
 
 #urlbar-display {
   margin-top: 0;
   margin-bottom: 0;
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
   color: GrayText;
 }
 
@@ -1097,15 +1097,15 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 
 #urlbar[pageproxystate="valid"] > #identity-box.verifiedIdentity {
   background: url("chrome://browser/skin/notify_v_sep.png") no-repeat right;
-  -moz-border-end: 0px solid #99BA79;
-  -moz-padding-end: 4px;
+  border-inline-end: 0px solid #99BA79;
+  padding-inline-end: 4px;
   color: #63a621;
 }
 
 #urlbar[pageproxystate="valid"] > #identity-box.verifiedDomain {
   background: url("chrome://browser/skin/notify_v_sep.png") no-repeat right;
-  -moz-border-end: 0px solid #799BB7;
-  -moz-padding-end: 4px;
+  border-inline-end: 0px solid #799BB7;
+  padding-inline-end: 4px;
   color: #2151A5;
 }
 
@@ -1115,8 +1115,8 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 }
 
 #identity-icon-labels {
-  -moz-margin-start: 2px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 2px;
+  margin-inline-end: 2px;
 }
 
 /* Location bar dropmarker */
@@ -1178,7 +1178,7 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
   -moz-image-region: rect(0px 54px 18px 36px);
   width: 18px; 
   height: 18px;
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
 }
 
 .ac-result-type-keyword,
@@ -1187,7 +1187,7 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
   list-style-image: url(chrome://global/skin/icons/search_box_icon.png);
   width: 16px;
   height: 16px;
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
 }
 
 .ac-result-type-tag,
@@ -1196,7 +1196,7 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
   list-style-image: url("chrome://browser/skin/places/tag.png");
   width: 16px; 
   height: 16px;
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
 }
 
 .ac-comment {
@@ -1380,14 +1380,14 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 
 .panel-promo-icon {
   list-style-image: url("chrome://browser/skin/sync-notification-24.png");
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
   vertical-align: middle;
 }
 
 .panel-promo-closebutton {
   -moz-appearance: none;
   border: none;
-  -moz-margin-end: -10px;
+  margin-inline-end: -10px;
   margin-top: -5px;
 }
 
@@ -1403,7 +1403,7 @@ sidebarheader {
 }
 
 #sidebar-title {
-  -moz-padding-start: 0px;
+  padding-inline-start: 0px;
   font-weight: bold;
 }
 
@@ -1417,19 +1417,19 @@ sidebarheader {
 
 .sidebar-splitter {
   border: 0;
-  -moz-border-end: 1px solid #999999;
+  border-inline-end: 1px solid #999999;
   min-width: 0;
   width: 3px;
    background-color: transparent;
-   -moz-margin-start: -3px;
+   margin-inline-start: -3px;
    position: relative;
 }
 
 #appcontent ~ .sidebar-splitter {
-   -moz-border-start: 1px solid #999999;
-   -moz-border-end: none;
-   -moz-margin-start: 0;
-   -moz-margin-end: -3px;
+   border-inline-start: 1px solid #999999;
+   border-inline-end: none;
+   margin-inline-start: 0;
+   margin-inline-end: -3px;
 }
 
 #TabsToolbar toolbarseparator {
@@ -1543,15 +1543,15 @@ sidebarheader {
 }
 
 .tabbrowser-arrowscrollbox > .arrowscrollbox-scrollbox {
-  -moz-padding-start: 0px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 0px;
+  padding-inline-end: 5px;
 }
 
 .tab-content {
   border: solid transparent;
   border-width: 6px 6px 5px 6px;
-  -moz-margin-start: 0;
-  -moz-margin-end: -5px;
+  margin-inline-start: 0;
+  margin-inline-end: -5px;
 }
 
 #tabbrowser-tabs > .tabbrowser-tab > .tab-stack > .tab-content {
@@ -1613,8 +1613,8 @@ sidebarheader {
 
 .tab-throbber,
 .tab-icon-image {
-  -moz-margin-start: 2px;
-  -moz-margin-end: 4px;
+  margin-inline-start: 2px;
+  margin-inline-end: 4px;
   margin-top: 0;
   width: 16px;
   height: 16px;
@@ -1631,8 +1631,8 @@ sidebarheader {
 
 .tab-throbber[pinned],
 .tab-icon-image[pinned] {
-  -moz-margin-start: 4px;
-  -moz-margin-end: 4px;
+  margin-inline-start: 4px;
+  margin-inline-end: 4px;
 }
 
 .tabbrowser-tab[selected="true"] .tab-throbber,
@@ -1673,13 +1673,13 @@ sidebarheader {
 
 /* Tab close button */
 .tab-close-button > .toolbarbutton-icon {
-  -moz-margin-end: 0px !important;
+  margin-inline-end: 0px !important;
 }
 
 .tab-close-button {
   -moz-appearance: none;
   pointer-events: auto;
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
   margin-top: -1px;
   border: none;
   padding: 0px;
@@ -1742,7 +1742,7 @@ sidebarheader {
   -moz-appearance: none; 
   border: 0 !important;
   padding: 0;
-  -moz-margin-start: 2px !important;
+  margin-inline-start: 2px !important;
   margin-bottom: 3px !important;
   background: transparent;
   list-style-image: url(chrome://browser/skin/tabbrowser/tab_new.png);
@@ -1778,7 +1778,7 @@ sidebarheader {
 }
 
 .tabs-newtab-button > .toolbarbutton-icon {
-  -moz-margin-start: 5px !important;
+  margin-inline-start: 5px !important;
 }
 
 #alltabs-button {
@@ -1892,7 +1892,7 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 
 #sidebar-throbber[loading="true"] {
   list-style-image: url("chrome://global/skin/icons/loading_16.png");
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
 }
 
 /* Bookmarks toolbar */
@@ -1911,7 +1911,7 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 .menupopup-drop-indicator {
   list-style-image: none;
   height: 2px;
-  -moz-margin-end: -4em;
+  margin-inline-end: -4em;
   background-color: Highlight;
 }
 
@@ -1937,13 +1937,13 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 /* Popup Body Text */
 .identity-popup-description {
   white-space: pre-wrap;
-  -moz-padding-start: 15px;
+  padding-inline-start: 15px;
   margin: 2px 0 4px;
 }
 
 .identity-popup-label {
   white-space: pre-wrap;
-  -moz-padding-start: 15px;
+  padding-inline-start: 15px;
   margin: 0;
 }
 
@@ -1977,7 +1977,7 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 #identity-popup-content-box.verifiedIdentity > #identity-popup-encryption ,
 #identity-popup-content-box.verifiedDomain > #identity-popup-encryption {
   margin-top: 10px;
-  -moz-margin-start: -24px;
+  margin-inline-start: -24px;
 }
 
 #identity-popup-content-box.verifiedIdentity > #identity-popup-encryption > vbox > #identity-popup-encryption-icon ,
@@ -1988,13 +1988,13 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 #identity-popup-more-info-button {
   margin-top: 6px;
   margin-bottom: 0;
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 .popup-notification-icon {
   width: 64px;
   height: 64px;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
 }
 
 .popup-notification-icon[popupid="geolocation"] {
@@ -2038,8 +2038,8 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 
 .popup-progress-label,
 .popup-progress-meter {
-  -moz-margin-start: 0;
-  -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
 }
 
 .popup-progress-cancel {
@@ -2098,15 +2098,15 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 /* Notification icon box */
 #notification-popup-box {
   border-radius: 2.5px 0 0 2.5px;
-  -moz-padding-end: 12px;
+  padding-inline-end: 12px;
   background: url("chrome://browser/skin/urlbar-arrow.png") no-repeat right;
-  -moz-margin-start: 3px;
-  -moz-margin-end: 0;
+  margin-inline-start: 3px;
+  margin-inline-end: 0;
   box-shadow: none !important;
 }
 
 #notification-popup-box:not([hidden]) + #identity-box {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 #notification-popup-box:-moz-locale-dir(rtl),
@@ -2593,7 +2593,7 @@ toolbar[mode="text"] #addonbar-closebutton > .toolbarbutton-icon {
   -moz-appearance: none;
   color: inherit;
   border-width: 0;
-  -moz-border-end: 1px solid hsla(210,8%,5%,.45);
+  border-inline-end: 1px solid hsla(210,8%,5%,.45);
   box-shadow: -1px 0 0 hsla(210,16%,76%,.15) inset, 1px 0 0 hsla(210,16%,76%,.15);
 }
 
@@ -3040,7 +3040,7 @@ html|*#gcli-output-frame {
 }
 
 .center-item-label {
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
   margin-bottom: 0;
   text-overflow: ellipsis;
 }
@@ -3050,7 +3050,7 @@ html|*#gcli-output-frame {
   background-repeat: no-repeat;
   width: 16px;
   height: 15px;
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
 }
 
 .click-to-play-plugins-notification-button-container {
@@ -3084,7 +3084,7 @@ html|*#gcli-output-frame {
   text-shadow: none;
   background-image: linear-gradient(#B4211B, #8A1915);
   border-radius: 1px;
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
 }
 
 /* Badge toolbar item */
@@ -3106,7 +3106,7 @@ html|*#gcli-output-frame {
 }
 
 .toolbarbutton-badge-stack > .toolbarbutton-icon[label]:not([label=""]) {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 #navigator-toolbox[iconsize=large][mode=icons] > #nav-bar *|* > .toolbarbutton-badge[badge]:not([badge=""])::after {
@@ -3267,8 +3267,8 @@ toolbar[brighttext] #uctb-toolbar-button .toolbarbutton-icon {
 
 .tab-progress-container {
   margin-top: 6px !important;
-  -moz-margin-start: 5px !important;
-  -moz-margin-end: 0px !important;
+  margin-inline-start: 5px !important;
+  margin-inline-end: 0px !important;
   pointer-events: none !important;
   -moz-box-ordinal-group: 100!important;
 }
@@ -3418,19 +3418,19 @@ menupopup[sticky="true"] {
 }
 
 #addons-page[aios-appOS="WINNT"] #header-utils-btn > .toolbarbutton-icon {
-  -moz-margin-start: 4px !important;
-  -moz-margin-end: 2px !important;
+  margin-inline-start: 4px !important;
+  margin-inline-end: 2px !important;
 }
 
 #addons-page[aios-appOS="WINNT"] #header-utils-btn > .toolbarbutton-menu-dropmarker {
-  -moz-margin-start: 0 !important;
-  -moz-margin-end: 0 !important;
+  margin-inline-start: 0 !important;
+  margin-inline-end: 0 !important;
   -moz-image-region: rect(0 16px 16px 0)!important;
 }
 
 #addons-page[aios-appOS="WINNT"] #view-port-container {
-  -moz-margin-start: -1px !important;
-  -moz-margin-end: -1px !important;
+  margin-inline-start: -1px !important;
+  margin-inline-end: -1px !important;
   border-radius: 0px !important;
 }
 
diff --git a/src/chrome/browser/downloads/allDownloadsViewOverlay.css b/src/chrome/browser/downloads/allDownloadsViewOverlay.css
index c206ce7..215db34 100644
--- a/src/chrome/browser/downloads/allDownloadsViewOverlay.css
+++ b/src/chrome/browser/downloads/allDownloadsViewOverlay.css
@@ -16,8 +16,8 @@
 }
 
 .downloadTypeIcon {
-  -moz-margin-end: 8px;
-  -moz-margin-start: 8px;
+  margin-inline-end: 8px;
+  margin-inline-start: 8px;
   /* explicitly size the icon, so size doesn't vary on hidpi systems */
   height: 32px;
   width: 32px;
diff --git a/src/chrome/browser/downloads/downloads.css b/src/chrome/browser/downloads/downloads.css
index e8920c4..e0fe038 100644
--- a/src/chrome/browser/downloads/downloads.css
+++ b/src/chrome/browser/downloads/downloads.css
@@ -58,7 +58,7 @@
 #downloadsSummary,
 richlistitem[type="download"] {
   height: 6em;
-  -moz-padding-end: 0;
+  padding-inline-end: 0;
   color: inherit;
 }
 
@@ -105,7 +105,7 @@ richlistitem[type="download"]:first-child {
 }
 
 .downloadTypeIcon {
-  -moz-margin-end: 8px;
+  margin-inline-end: 8px;
   /* Prevent flickering when changing states. */
   height: 32px;
   width: 32px;
@@ -366,7 +366,7 @@ toolbar[brighttext] #downloads-indicator-counter {
   background-image: linear-gradient(#505050, #575757);
   border: 1px solid;
   border-color: hsla(0,0%,0%,.6) hsla(0,0%,0%,.4) hsla(0,0%,0%,.4);
-  -moz-border-start: none;
+  border-inline-start: none;
   border-radius: 0 2px 2px 0;
 }
 
diff --git a/src/chrome/browser/engineManager.css b/src/chrome/browser/engineManager.css
index 6a1076e..0a9ccf2 100644
--- a/src/chrome/browser/engineManager.css
+++ b/src/chrome/browser/engineManager.css
@@ -1,7 +1,7 @@
 
 #engineList treechildren::-moz-tree-image(engineName) {
-  -moz-margin-end: 4px;
-  -moz-margin-start: 1px;
+  margin-inline-end: 4px;
+  margin-inline-start: 1px;
   width: 16px;
   height: 16px;
 }
diff --git a/src/chrome/browser/feeds/subscribe-ui.css b/src/chrome/browser/feeds/subscribe-ui.css
index 8ca5328..f21c037 100644
--- a/src/chrome/browser/feeds/subscribe-ui.css
+++ b/src/chrome/browser/feeds/subscribe-ui.css
@@ -7,17 +7,17 @@
 }
 
 .handlersMenuPopup > menuitem {
-  -moz-padding-start: 23px;
+  padding-inline-start: 23px;
 }
 
 .handlersMenuPopup > menuitem.menuitem-iconic {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 .handlersMenuPopup > .menuitem-iconic  > .menu-iconic-left {
   display: -moz-box;
   min-width: 16px;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
 }
 
 .chooseApplicationMenuItem {
diff --git a/src/chrome/browser/feeds/subscribe.css b/src/chrome/browser/feeds/subscribe.css
index 1a6e4a2..42a1a7b 100644
--- a/src/chrome/browser/feeds/subscribe.css
+++ b/src/chrome/browser/feeds/subscribe.css
@@ -10,7 +10,7 @@ html {
 #feedBody {
   border: 1px solid #7B9EC1;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   margin: 2em auto;
   background: #FFFFFF;
   border-radius: 4px;
@@ -28,9 +28,9 @@ html {
 #feedHeader {  
   margin-top: 4.9em;
   margin-bottom: 1em;
-  -moz-margin-start: 1.4em;
-  -moz-margin-end: 1em;
-  -moz-padding-start: 2.9em;
+  margin-inline-start: 1.4em;
+  margin-inline-end: 1em;
+  padding-inline-start: 2.9em;
   font-size: 110%;
   color: #003366;
 }
@@ -57,12 +57,12 @@ html {
 
 #feedHeader[firstrun="true"] #feedIntroText {
   padding-top: 0.1em;
-  -moz-padding-start: 0.6em;
+  padding-inline-start: 0.6em;
   display: block;
 }
 
 #feedHeader[firstrun="true"] > #feedSubscribeLine {
-  -moz-padding-start: 1.8em;
+  padding-inline-start: 1.8em;
 }
 
 #feedSubscribeLine {
@@ -98,8 +98,8 @@ h2 {
 
 #feedTitleLink {
   float: right;
-  -moz-margin-start: .6em;
-  -moz-margin-end: 0;
+  margin-inline-start: .6em;
+  margin-inline-end: 0;
   margin-top: 0;
   margin-bottom: 0;
 }
@@ -109,15 +109,15 @@ a[href] img {
 }
 
 #feedTitleContainer {
-  -moz-margin-start: 0;
-  -moz-margin-end: .6em;
+  margin-inline-start: 0;
+  margin-inline-end: .6em;
   margin-top: 0;
   margin-bottom: 0;
 }
 
 #feedTitleImage {
-  -moz-margin-start: .6em;
-  -moz-margin-end: 0;
+  margin-inline-start: .6em;
+  margin-inline-end: 0;
   margin-top: 0;
   margin-bottom: 0;
   max-width: 300px;
diff --git a/src/chrome/browser/newtab/newTab.css b/src/chrome/browser/newtab/newTab.css
index efbfb24..16e320c 100644
--- a/src/chrome/browser/newtab/newTab.css
+++ b/src/chrome/browser/newtab/newTab.css
@@ -89,7 +89,7 @@
 
 /* CELLS */
 .newtab-cell {
-  -moz-margin-end: 20px;
+  margin-inline-end: 20px;
   background-color: rgba(255,255,255,.2);
   border: 1px solid;
   border-color: rgba(8,22,37,.12) rgba(8,22,37,.14) rgba(8,22,37,.16);
@@ -103,7 +103,7 @@
 }
 
 .newtab-cell:last-child {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 .newtab-cell:hover:not(:empty):not([dragged]) {
diff --git a/src/chrome/browser/pageInfo.css b/src/chrome/browser/pageInfo.css
index 466ff1b..53d8414 100644
--- a/src/chrome/browser/pageInfo.css
+++ b/src/chrome/browser/pageInfo.css
@@ -6,7 +6,7 @@
 
 /* View buttons */
 #viewGroup {
-  -moz-padding-start: 10px;
+  padding-inline-start: 10px;
 }
 
 #viewGroup > radio {
@@ -31,7 +31,7 @@
 
 #topBar {
   border-bottom: 2px groove ThreeDFace;
-  -moz-padding-start: 10px;
+  padding-inline-start: 10px;
   background-color: -moz-Field;
   color: -moz-FieldText;
 }
@@ -98,7 +98,7 @@ textbox {
 }
 
 textbox.header {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 .iframe {
@@ -121,8 +121,8 @@ groupbox.collapsable caption .caption-icon {
   height: 9px;
   background-repeat: no-repeat;
   background-position: center;
-  -moz-margin-start: 2px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 2px;
+  margin-inline-end: 2px;
   background-image: url("chrome://global/skin/tree/twisty-open.png");
 }
 
@@ -142,7 +142,7 @@ groupbox tree {
 }
 
 #securityBox description { 
-  -moz-margin-start: 10px;
+  margin-inline-start: 10px;
 }
 
 #general-security-identity {
@@ -187,8 +187,8 @@ treechildren::-moz-tree-cell-text(broken) {
 #feedListbox richlistitem {
   padding-top: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 7px;
-  -moz-padding-end: 7px;
+  padding-inline-start: 7px;
+  padding-inline-end: 7px;
   min-height: 25px;
   border-bottom: 1px dotted #C0C0C0;
 }
@@ -225,8 +225,8 @@ treechildren::-moz-tree-cell-text(broken) {
 .permission {
   padding-top: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 7px;
-  -moz-padding-end: 7px;
+  padding-inline-start: 7px;
+  padding-inline-end: 7px;
   min-height: 25px;
   border-bottom: 1px dotted #C0C0C0;
 }
diff --git a/src/chrome/browser/permissions/aboutPermissions.css b/src/chrome/browser/permissions/aboutPermissions.css
index 82d476c..d75b590 100644
--- a/src/chrome/browser/permissions/aboutPermissions.css
+++ b/src/chrome/browser/permissions/aboutPermissions.css
@@ -42,7 +42,7 @@
 .site-favicon {
   height: 16px;
   width: 16px;
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
 }
 
@@ -59,7 +59,7 @@
 
 #site-description {
   font-size: 125%;
-  -moz-margin-start: 6px; /* to match button margin */
+  margin-inline-start: 6px; /* to match button margin */
 }
 
 #site-label {
@@ -71,7 +71,7 @@
 #defaults-description {
   font-size: 125%;
   font-weight: bold;
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
 }
 
 .pref-item {
@@ -81,7 +81,7 @@
 .pref-icon {
   width: 48px;
   height: 48px;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
 }
 
 .pref-icon[type="password"] {
diff --git a/src/chrome/browser/places/editBookmarkOverlay.css b/src/chrome/browser/places/editBookmarkOverlay.css
index be3ea83..3d67cd3 100644
--- a/src/chrome/browser/places/editBookmarkOverlay.css
+++ b/src/chrome/browser/places/editBookmarkOverlay.css
@@ -24,7 +24,7 @@
 .expander-down {
   min-width: 0;
   margin: 0;
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
 }
 
 .expander-up > .button-box,
diff --git a/src/chrome/browser/places/organizer.css b/src/chrome/browser/places/organizer.css
index 868edf9..69ab14c 100644
--- a/src/chrome/browser/places/organizer.css
+++ b/src/chrome/browser/places/organizer.css
@@ -9,7 +9,7 @@
 /* Toolbar */
 #placesToolbar {
   padding: 3px;
-  -moz-padding-end: 6px;
+  padding-inline-end: 6px;
 }
 
 #placesToolbar > toolbarbutton[disabled] > .toolbarbutton-icon {
@@ -36,14 +36,14 @@
 
 /* Menu */
 #placesMenu {
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
   -moz-appearance: none;
   border: none;
 }
 
 #placesMenu > menu {
-  -moz-padding-start: 4px;
-  -moz-padding-end: 1px;
+  padding-inline-start: 4px;
+  padding-inline-end: 1px;
   padding-top: 2px;
   padding-bottom: 2px;
   -moz-appearance: toolbarbutton;
@@ -61,14 +61,14 @@
 
 #placesMenu > menu[open="true"] {
   border-color: ThreeDShadow ThreeDHighlight ThreeDHighlight ThreeDShadow;
-  -moz-padding-start: 5px;
-  -moz-padding-end: 0px;
+  padding-inline-start: 5px;
+  padding-inline-end: 0px;
   padding-top: 3px;
   padding-bottom: 1px;
 }
 
 #placesMenu > menu > .menubar-text {
-  -moz-padding-end: 8px;
+  padding-inline-end: 8px;
   background: url(chrome://global/skin/arrow/arrow-dn.gif) right center no-repeat;
 }
 
@@ -119,8 +119,8 @@
 }
 
 #clearDownloadsButton {
-  -moz-padding-start: 9px;
-  -moz-padding-end: 9px;
+  padding-inline-start: 9px;
+  padding-inline-end: 9px;
 }
 
 /* Root View */
@@ -135,7 +135,7 @@
 }
 
 #infoBoxExpanderLabel {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 #searchFilter {
@@ -164,10 +164,10 @@
 
 #placesView > splitter {
   border: 0;
-  -moz-border-end: 1px solid #999999;
+  border-inline-end: 1px solid #999999;
   min-width: 0;
   width: 3px;
   background-color: transparent;
-  -moz-margin-start: -3px;
+  margin-inline-start: -3px;
   position: relative;
 }
diff --git a/src/chrome/browser/places/places.css b/src/chrome/browser/places/places.css
index 9381e56..9ba2688 100644
--- a/src/chrome/browser/places/places.css
+++ b/src/chrome/browser/places/places.css
@@ -153,7 +153,7 @@ treechildren::-moz-tree-cell-text(cutting) {
 #viewButton > .button-box > .button-menu-dropmarker {
   height: auto;
   width: auto;
-  -moz-margin-end: -3px;
+  margin-inline-end: -3px;
 }
 
 /* Style Places sidebars as Vista media collection */
diff --git a/src/chrome/browser/preferences/applications.css b/src/chrome/browser/preferences/applications.css
index 80699b4..fdf5614 100644
--- a/src/chrome/browser/preferences/applications.css
+++ b/src/chrome/browser/preferences/applications.css
@@ -11,18 +11,18 @@
 .actionsMenu {
   margin-top: 0;
   margin-bottom: 0;
-  -moz-margin-start: -2px;
-  -moz-margin-end: 0;
+  margin-inline-start: -2px;
+  margin-inline-end: 0;
 }
 
 .typeIcon,
 .actionIcon {
-  -moz-margin-start: 3px;
-  -moz-margin-end: 3px;
+  margin-inline-start: 3px;
+  margin-inline-end: 3px;
 }
 
 richlistitem label {
-  -moz-margin-start: 1px;
+  margin-inline-start: 1px;
   margin-top: 2px;
 }
 
@@ -51,14 +51,14 @@ menuitem[appHandlerIcon="plugin"] {
 }
 
 .actionsMenu .menulist-icon {
-  -moz-margin-end: 3px;
+  margin-inline-end: 3px;
 }
 
 .actionsMenu > menupopup > menuitem > .menu-iconic-left {
-  -moz-padding-start: 0px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 0px;
+  padding-inline-end: 2px;
 }
 
 .actionsMenu > menupopup > menuitem {
-  -moz-padding-start: 4px;
+  padding-inline-start: 4px;
 }
diff --git a/src/chrome/browser/sanitizeDialog.css b/src/chrome/browser/sanitizeDialog.css
index 7da1505..ffdd4e8 100644
--- a/src/chrome/browser/sanitizeDialog.css
+++ b/src/chrome/browser/sanitizeDialog.css
@@ -3,12 +3,12 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #sanitizeDurationChoice {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 /* Align the duration label with the warning box and item list */
 #sanitizeDurationLabel {
-  -moz-margin-start: 3px;
+  margin-inline-start: 3px;
 }
 
 
@@ -61,7 +61,7 @@
 .expander-down {
   min-width: 0;
   margin: 0;
-  -moz-margin-start: 3px;
+  margin-inline-start: 3px;
 }
 
 .expander-up > .button-box,
@@ -80,15 +80,15 @@
 
 /* Make the item list the same width as the warning box */
 #itemList {
-  -moz-margin-start: 0;
-  -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
 }
 
 
 /* Align the last dialog button with the end of the warning box */
 .prefWindow-dlgbuttons {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 .dialog-button[dlgtype="cancel"] {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
diff --git a/src/chrome/browser/searchbar.css b/src/chrome/browser/searchbar.css
index 1367cd4..c7b8d17 100644
--- a/src/chrome/browser/searchbar.css
+++ b/src/chrome/browser/searchbar.css
@@ -21,7 +21,7 @@
   height: 16px;
   width: 16px;
   list-style-image: url("chrome://global/skin/icons/search_box_icon.png");
-  -moz-margin-start: 2px;
+  margin-inline-start: 2px;
 }
 
 .searchbar-engine-button {
@@ -29,8 +29,8 @@
   min-width: 0;
   margin: 0;
   padding: 0;
-  -moz-padding-start: 3px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 3px;
+  padding-inline-end: 2px;
   -moz-box-align: center;
   background: none;
   border: none;
@@ -55,8 +55,8 @@
   font-style: italic;
   -moz-box-align: center;
   margin: 0;
-  -moz-padding-start: 3px;
-  -moz-padding-end: 3px;
+  padding-inline-start: 3px;
+  padding-inline-end: 3px;
   background-origin: border-box;
   border: none;
 }
diff --git a/src/chrome/browser/statusbar/overlay.css b/src/chrome/browser/statusbar/overlay.css
index 99105c8..c15e920 100644
--- a/src/chrome/browser/statusbar/overlay.css
+++ b/src/chrome/browser/statusbar/overlay.css
@@ -189,7 +189,7 @@ splitter.status4evar-status-splitter:not(:hover) {
 }
 
 toolbar[mode="icons"] #status4evar-download-button[forcelabel="true"] > label {
-	-moz-margin-start: 5px !important;
+	margin-inline-start: 5px !important;
 }
 
 /*
@@ -206,7 +206,7 @@ splitter.status4evar-status-splitter {
  */
 
 #urlbar-progress-alt {
-	-moz-margin-end: -2px;
+	margin-inline-end: -2px;
 }
 
 /*
diff --git a/src/chrome/browser/syncCommon.css b/src/chrome/browser/syncCommon.css
index 673d218..3d2c593 100644
--- a/src/chrome/browser/syncCommon.css
+++ b/src/chrome/browser/syncCommon.css
@@ -8,7 +8,7 @@
 }
 
 .statusIcon {
-  -moz-margin-start: 4px;
+  margin-inline-start: 4px;
   max-height: 16px;
   max-width: 16px;
 }
diff --git a/src/chrome/browser/syncSetup.css b/src/chrome/browser/syncSetup.css
index fff65e9..8898951 100644
--- a/src/chrome/browser/syncSetup.css
+++ b/src/chrome/browser/syncSetup.css
@@ -99,7 +99,7 @@ description > .text-link:focus {
 }
 
 .inputColumn {
-  -moz-margin-end: 2px
+  margin-inline-end: 2px
 }
 
 .pin {
diff --git a/src/chrome/browser/tabview/tabview.css b/src/chrome/browser/tabview/tabview.css
index 43b2fa4..64759d5 100644
--- a/src/chrome/browser/tabview/tabview.css
+++ b/src/chrome/browser/tabview/tabview.css
@@ -19,9 +19,9 @@ body {
 .tab {
   margin: 4px;
   padding-top: 4px;
-  -moz-padding-end: 6px;
+  padding-inline-end: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 4px;
+  padding-inline-start: 4px;
   background-color: #E0EAF5;
   border-radius: 0.4em;
   cursor: pointer;
@@ -53,12 +53,12 @@ html[dir=rtl] .thumb {
 .favicon {
   background-color: #E0EAF5;
   padding-top: 4px;
-  -moz-padding-end: 6px;
+  padding-inline-end: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 4px;
+  padding-inline-start: 4px;
   top: 4px;
   left: 4px;
-  -moz-border-end: 1px solid rgba(73, 99, 119, 0.3);
+  border-inline-end: 1px solid rgba(73, 99, 119, 0.3);
   border-bottom: 1px solid rgba(73, 99, 119, 0.3);
   height: 17px;
   width: 17px;
@@ -272,7 +272,7 @@ html[dir=rtl] .overlay {
 .appTabTrayContainer {
   top: 34px;
   right: 1px;
-  -moz-border-start: 1px solid #E1E1E1;
+  border-inline-start: 1px solid #E1E1E1;
   padding: 0 5px;
   overflow: -moz-hidden-unscrollable;
   text-align: start;
@@ -320,8 +320,8 @@ html[dir=rtl] .appTabTrayContainer {
   background-color: #A0A0A0;
   padding-top: 3px;
   padding-bottom: 3px;
-  -moz-padding-start: 5px;
-  -moz-padding-end: 20px;
+  padding-inline-start: 5px;
+  padding-inline-end: 20px;
   width: 135px;
   line-height: 25px;
   box-shadow: 0px 1px 0px rgba(255,255,255,.5), 0px -1px 0px rgba(0,0,0,.24);
@@ -359,7 +359,7 @@ html[dir=rtl] .undo .close {
   opacity: 0.9;
   border: 1px dashed  rgba(0,0,0,.12);
   border-bottom: none;
-  -moz-border-end: none;
+  border-inline-end: none;
   box-shadow: 1px 1px 0 rgba(255,255,255,.15);
 }
 
@@ -419,9 +419,9 @@ input.name {
   border: 1px solid transparent;
   color: #999;
   margin-top: 3px;
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
   margin-bottom: 0;
-  -moz-margin-start: 3px;
+  margin-inline-start: 3px;
   padding: 1px;
 }
 
@@ -462,9 +462,9 @@ input.name:focus::-moz-placeholder {
 
 .title-shield {
   margin-top: 3px;
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
   margin-bottom: 0;
-  -moz-margin-start: 3px;
+  margin-inline-start: 3px;
   padding: 1px;
   left: 0;
   top: 0;
@@ -536,7 +536,7 @@ html[dir=rtl] .iq-resizable-se {
 #exit-button {
   width: 18px;
   height: 18px;
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
   margin-top: 2px;
   background-image: -moz-image-rect(url(chrome://browser/skin/tabview/tabview.png), 0, 90, 18, 72);
   background-attachment: scroll;
@@ -576,15 +576,15 @@ html[dir=rtl] .iq-resizable-se {
 #searchbox{
   width: 270px;
   max-width: -moz-available;
-  -moz-margin-start: 20px;
+  margin-inline-start: 20px;
   height: 30px;
   box-shadow: 0px 1px 0px rgba(255,255,255,.5), 0px -1px 0px rgba(0,0,0,1), 0px 0px 9px rgba(0,0,0,.8);
   color: white;
   border: none;
   background-color: #272727;
   border-radius: 0.4em;
-  -moz-padding-start: 5px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 5px;
+  padding-inline-end: 5px;
   font-size: 14px;
 }
 
@@ -619,7 +619,7 @@ html[dir=rtl] #actions {
   width: 20px;
   height: 20px;
   margin-top: 3px;
-  -moz-margin-end: 1px;
+  margin-inline-end: 1px;
 }
 
 .notMainMatch{
@@ -643,8 +643,8 @@ html[dir=rtl] #otherresults {
 #otherresults .label {
   color: #999;
   line-height: 30px;
-  -moz-margin-start: 5px;
-  -moz-margin-end: 5px;
+  margin-inline-start: 5px;
+  margin-inline-end: 5px;
 }
 
 .inlineMatch {
@@ -652,10 +652,10 @@ html[dir=rtl] #otherresults {
   border-radius: 0.4em;
   box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
   border: 1px solid rgba(255, 255, 255, 0.5);
-  -moz-padding-start: 3px;
-  -moz-padding-end: 3px;
+  padding-inline-start: 3px;
+  padding-inline-end: 3px;
   height: 20px;
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
   cursor: pointer;
 }
 
@@ -664,7 +664,7 @@ html[dir=rtl] #otherresults {
 }
 
 .inlineMatch > img {
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
   position: relative;
   top: 2px;
   width: 16px;
diff --git a/src/chrome/global/about.css b/src/chrome/global/about.css
index f26fe92..5c40dbf 100644
--- a/src/chrome/global/about.css
+++ b/src/chrome/global/about.css
@@ -17,7 +17,7 @@ body {
   border: 1px solid ThreeDShadow;
   border-radius: 10px;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   background: -moz-Field;
 }
 
@@ -37,7 +37,7 @@ img {
 
 ul {
   margin: 0;
-  -moz-margin-start: 1.5em;
+  margin-inline-start: 1.5em;
   padding: 0;
   list-style: square;
 }
diff --git a/src/chrome/global/aboutSupport.css b/src/chrome/global/aboutSupport.css
index b955d06..9f28e9a 100644
--- a/src/chrome/global/aboutSupport.css
+++ b/src/chrome/global/aboutSupport.css
@@ -85,8 +85,8 @@ td {
   float: right;
   margin-top: 2em;
   margin-bottom: 20px;
-  -moz-margin-start: 20px;
-  -moz-margin-end: 0;
+  margin-inline-start: 20px;
+  margin-inline-end: 0;
   padding: 16px;
   width: 30%;
 }
diff --git a/src/chrome/global/autocomplete.css b/src/chrome/global/autocomplete.css
index e30a33c..7b6cb28 100644
--- a/src/chrome/global/autocomplete.css
+++ b/src/chrome/global/autocomplete.css
@@ -89,7 +89,7 @@ panel[type="private-autocomplete-richlistbox"] .tree-rows {
 
 .autocomplete-treebody::-moz-tree-cell-text,
 .private-autocomplete-treebody::-moz-tree-cell-text {
-  -moz-padding-start: 8px;
+  padding-inline-start: 8px;
 }
 
 .autocomplete-treebody::-moz-tree-image(treecolAutoCompleteValue),
@@ -138,8 +138,8 @@ panel[type="private-autocomplete-richlistbox"] .tree-rows {
 .ac-type-icon {
   width: 16px; 
   height: 16px;
-  -moz-margin-start: 6px;
-  -moz-margin-end: 4px;
+  margin-inline-start: 6px;
+  margin-inline-end: 4px;
   margin-bottom: -1px;
 }
 
diff --git a/src/chrome/global/button.css b/src/chrome/global/button.css
index 66c02f9..e68326a 100644
--- a/src/chrome/global/button.css
+++ b/src/chrome/global/button.css
@@ -21,8 +21,8 @@ button {
   border-color: #AAA;
   box-shadow: #E6E6E6 1px 1px 2px 0px;
   color: #000000;
-  -moz-padding-start: 8px;
-  -moz-padding-end: 8px;
+  padding-inline-start: 8px;
+  padding-inline-end: 8px;
 }
 
 button:not([disabled="true"]):hover {
@@ -46,8 +46,8 @@ button[checked="true"] {
   border: 1px solid transparent;
   padding-top: 2px;
   padding-bottom: 3px;
-  -moz-padding-start: 3px;
-  -moz-padding-end: 4px;
+  padding-inline-start: 3px;
+  padding-inline-end: 4px;
 }
 
 .button-text {
diff --git a/src/chrome/global/checkbox.css b/src/chrome/global/checkbox.css
index a66b133..7beca52 100644
--- a/src/chrome/global/checkbox.css
+++ b/src/chrome/global/checkbox.css
@@ -16,18 +16,18 @@ checkbox {
   margin: 2px 5px;
   padding-top: 1px;
   padding-bottom: 1px;
-  -moz-padding-start: 4px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 4px;
+  padding-inline-end: 2px;
 }
 
 .checkbox-label-box {
-  -moz-margin-start: 2px;
+  margin-inline-start: 2px;
   padding: 0px 1px;
   border: 1px solid transparent;
 }
 
 .checkbox-icon {
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
 }
 
 .checkbox-label {
diff --git a/src/chrome/global/commonDialog.css b/src/chrome/global/commonDialog.css
index bcf982f..561e007 100644
--- a/src/chrome/global/commonDialog.css
+++ b/src/chrome/global/commonDialog.css
@@ -1,4 +1,4 @@
 #filler {
-  -moz-margin-start: -8px;
-  -moz-margin-end: -10px;
+  margin-inline-start: -8px;
+  margin-inline-end: -10px;
 }
diff --git a/src/chrome/global/console/console.css b/src/chrome/global/console/console.css
index 6f7ecaf..6b85ca5 100644
--- a/src/chrome/global/console/console.css
+++ b/src/chrome/global/console/console.css
@@ -26,7 +26,7 @@
 
 .console-row-icon {
   padding: 4px;
-  -moz-padding-start: 5px;
+  padding-inline-start: 5px;
   -moz-box-align: start !important;
 }
 
@@ -52,8 +52,8 @@
 .console-row-code {
   padding-top: 3px;
   padding-bottom: 3px;
-  -moz-padding-start: 3px;
-  -moz-padding-end: 0px;
+  padding-inline-start: 3px;
+  padding-inline-end: 0px;
   color: #0000BB;
   font-size: larger;
 }
@@ -118,8 +118,8 @@
 #ButtonEval {
   margin-top: 2px !important;
   margin-bottom: 2px !important;
-  -moz-margin-start: 0px !important;
-  -moz-margin-end: 2px !important;
+  margin-inline-start: 0px !important;
+  margin-inline-end: 2px !important;
 }
 
 toolbarseparator {
@@ -135,8 +135,8 @@ toolbarseparator {
 
 toolbar#ToolbarMode toolbarbutton:active,
 toolbar#ToolbarMode toolbarbutton[checked="true"] {
-  -moz-padding-start: 5px !important;
-  -moz-padding-end: 3px !important;
+  padding-inline-start: 5px !important;
+  padding-inline-end: 3px !important;
 }
 
 
@@ -200,15 +200,15 @@ toolbar#ToolbarMode .toolbarbutton-icon {
 }
 
 toolbar#ToolbarMode .toolbarbutton-text {
-  -moz-padding-end: 4px;
+  padding-inline-end: 4px;
 }
 
 
 /* ::::: Fix Error Console toolbar button text spacing ::::: */
 
 .toolbarbutton-text {
-  -moz-padding-start: 0px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 0px;
+  padding-inline-end: 5px;
 }
 
 #ToolbarMode {
diff --git a/src/chrome/global/datetimepicker.css b/src/chrome/global/datetimepicker.css
index ee78e7f..b6f9429 100644
--- a/src/chrome/global/datetimepicker.css
+++ b/src/chrome/global/datetimepicker.css
@@ -52,15 +52,15 @@ datepicker, timepicker {
 .datetimepicker-input-box {
   -moz-appearance: textfield;
   cursor: text;
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
   border: 2px solid;
   -moz-border-top-colors: ThreeDShadow ThreeDDarkShadow;
   -moz-border-right-colors: ThreeDHighlight ThreeDLightShadow;
   -moz-border-bottom-colors: ThreeDHighlight ThreeDLightShadow;
   -moz-border-left-colors: ThreeDShadow ThreeDDarkShadow;
   padding: 2px 0 3px 0;
-  -moz-padding-start: 4px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 4px;
+  padding-inline-end: 2px;
   background-color: -moz-Field;
   color: -moz-FieldText;
 }
diff --git a/src/chrome/global/dialog.css b/src/chrome/global/dialog.css
index cc6ed9e..25c567e 100644
--- a/src/chrome/global/dialog.css
+++ b/src/chrome/global/dialog.css
@@ -46,8 +46,8 @@
 dialog { 
   padding-top: 8px;
   padding-bottom: 10px;
-  -moz-padding-start: 8px;
-  -moz-padding-end: 10px;
+  padding-inline-start: 8px;
+  padding-inline-end: 10px;
 }
 
 /* ::::: dialog buttons ::::: */
@@ -83,16 +83,16 @@ dialogheader {
   -moz-box-orient: vertical;
   margin-top: -8px;
   margin-bottom: 0;
-  -moz-margin-start: -8px;
-  -moz-margin-end: -10px;
+  margin-inline-start: -8px;
+  margin-inline-end: -10px;
   border-left: none;
   border-right: none;
   border-top: none;
   -moz-border-bottom-colors: ThreeDHighlight ThreeDShadow;
   padding-top: 12px;
   padding-bottom: 12px;
-  -moz-padding-start: 25px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 25px;
+  padding-inline-end: 5px;
   background-color: Window;
   color: WindowText;
 }
@@ -103,5 +103,5 @@ dialogheader {
 }
 
 .header-large > .dialogheader-description {
-  -moz-margin-start: 12px !important;
+  margin-inline-start: 12px !important;
 }
diff --git a/src/chrome/global/dirListing/dirListing.css b/src/chrome/global/dirListing/dirListing.css
index 0601156..79d3246 100644
--- a/src/chrome/global/dirListing/dirListing.css
+++ b/src/chrome/global/dirListing/dirListing.css
@@ -89,12 +89,12 @@ td:not(:first-child) {
 
 .up {
   padding: 0 .5em;
-  -moz-margin-start: 20px;
+  margin-inline-start: 20px;
 }
 
 .up::before {
-  -moz-margin-end: 4px;
-  -moz-margin-start: -20px;
+  margin-inline-end: 4px;
+  margin-inline-start: -20px;
   vertical-align: middle;
   content: url(chrome://global/skin/dirListing/up.png);
 }
diff --git a/src/chrome/global/dropmarker.css b/src/chrome/global/dropmarker.css
index 74fca19..7ab509e 100644
--- a/src/chrome/global/dropmarker.css
+++ b/src/chrome/global/dropmarker.css
@@ -22,8 +22,8 @@ dropmarker:hover:active:not([disabled="true"]) {
   -moz-border-left-colors: ThreeDShadow ThreeDFace;
   padding-top: 2px;
   padding-bottom: 0px;
-  -moz-padding-start: 2px;
-  -moz-padding-end: 0px;
+  padding-inline-start: 2px;
+  padding-inline-end: 0px;
 }
 
 dropmarker[disabled="true"] {
diff --git a/src/chrome/global/expander.css b/src/chrome/global/expander.css
index d643d8c..5121576 100644
--- a/src/chrome/global/expander.css
+++ b/src/chrome/global/expander.css
@@ -42,6 +42,6 @@
 .settingsContainer {
   padding-top: 3px;
   padding-bottom: 5px;
-  -moz-padding-start: 20px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 20px;
+  padding-inline-end: 5px;
 }
diff --git a/src/chrome/global/filefield.css b/src/chrome/global/filefield.css
index 5bc5e34..f1e778b 100644
--- a/src/chrome/global/filefield.css
+++ b/src/chrome/global/filefield.css
@@ -57,8 +57,8 @@ filefield {
   height: 16px;
   margin-top: 1px;
   margin-bottom: 1px;
-  -moz-margin-start: 1px;
-  -moz-margin-end: 4px;
+  margin-inline-start: 1px;
+  margin-inline-end: 4px;
 }
 
 .fileFieldLabel {
diff --git a/src/chrome/global/findBar.css b/src/chrome/global/findBar.css
index 09fae13..cd2d57f 100644
--- a/src/chrome/global/findBar.css
+++ b/src/chrome/global/findBar.css
@@ -9,10 +9,10 @@
 }
 
 .findbar-closebutton > .toolbarbutton-icon {
-  -moz-margin-start: 4px !important;
-  -moz-margin-end: 0px !important;
-  -moz-padding-end: 0px !important;
-  -moz-padding-start: 2px !important;
+  margin-inline-start: 4px !important;
+  margin-inline-end: 0px !important;
+  padding-inline-end: 0px !important;
+  padding-inline-start: 2px !important;
 }
 
 findbar {
@@ -83,15 +83,15 @@ findbar[hidden] {
   list-style-image: none;
   margin-top: 2px;
   margin-bottom: 0px;
-  -moz-margin-start: 12px;
-  -moz-margin-end: 0px;
+  margin-inline-start: 12px;
+  margin-inline-end: 0px;
   width: 16px;
   height: 16px;
 }
 
 .findbar-find-status {
   margin: 0 !important;
-  -moz-margin-start: 3px !important;
+  margin-inline-start: 3px !important;
   padding: 2px !important;
 }
 
diff --git a/src/chrome/global/global.css b/src/chrome/global/global.css
index 3f94ed9..5f3a04d 100644
--- a/src/chrome/global/global.css
+++ b/src/chrome/global/global.css
@@ -43,8 +43,8 @@ prefwindow {
 window.dialog {
   padding-top: 8px;
   padding-bottom: 10px;
-  -moz-padding-start: 8px;
-  -moz-padding-end: 10px;
+  padding-inline-start: 8px;
+  padding-inline-end: 10px;
 }
 
 /* ::::: alert icons :::::*/
@@ -106,7 +106,7 @@ statusbarpanel:not(.statusbar-resizerpanel):-moz-lwtheme {
   -moz-appearance: none;
   border-top-style: none;
   border-bottom-style: none;
-  -moz-border-start-style: none;
+  border-inline-start-style: none;
 }
 
 .statusbar-resizerpanel {
@@ -132,7 +132,7 @@ sidebarheader {
 }
 
 sidebarheader > label {
-  -moz-padding-start: 4px;
+  padding-inline-start: 4px;
 }
 
 .toolbar-focustarget {
@@ -225,8 +225,8 @@ label {
   cursor: default;
   margin-top: 1px;
   margin-bottom: 2px;
-  -moz-margin-start: 6px;
-  -moz-margin-end: 5px;
+  margin-inline-start: 6px;
+  margin-inline-end: 5px;
 }
 
 description {
@@ -255,7 +255,7 @@ label[disabled="true"]:-moz-system-metric(windows-classic) {
 }
 
 .indent {
-  -moz-margin-start: 23px;
+  margin-inline-start: 23px;
 }
 
 .box-padded {
diff --git a/src/chrome/global/listbox.css b/src/chrome/global/listbox.css
index 11b4fc3..4988037 100644
--- a/src/chrome/global/listbox.css
+++ b/src/chrome/global/listbox.css
@@ -111,12 +111,12 @@ listheader[sortable="true"]:hover:active {
   -moz-border-left-colors: ThreeDShadow -moz-Dialog;
   padding-top: 1px;
   padding-bottom: 0px;
-  -moz-padding-start: 5px;
-  -moz-padding-end: 4px;
+  padding-inline-start: 5px;
+  padding-inline-end: 4px;
 }
 
 .listheader-icon {
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
 }
 
 .listheader-label {
@@ -152,13 +152,13 @@ listheader[sortable="true"]:hover:active {
   margin: 0px !important;
   padding-top: 0px;
   padding-bottom: 1px;
-  -moz-padding-start: 4px;
-  -moz-padding-end: 0px;
+  padding-inline-start: 4px;
+  padding-inline-end: 0px;
   white-space: nowrap;
 }
 
 .listcell-icon {
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
 }
 
 .listcell-label[disabled="true"] {
diff --git a/src/chrome/global/media/videocontrols.css b/src/chrome/global/media/videocontrols.css
index 6907620..9ea4de6 100644
--- a/src/chrome/global/media/videocontrols.css
+++ b/src/chrome/global/media/videocontrols.css
@@ -127,7 +127,7 @@
   overflow: hidden;
   margin: 0;
   padding: 2px 10px;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
   border: none;
   color: rgba(255,255,255,.5);
   background-color: rgba(35,31,32,.74);
diff --git a/src/chrome/global/netError.css b/src/chrome/global/netError.css
index c5f81e9..ca16c8a 100644
--- a/src/chrome/global/netError.css
+++ b/src/chrome/global/netError.css
@@ -28,7 +28,7 @@ h1 {
 
 ul, ol {
   margin: 0;
-  -moz-margin-start: 1.5em;
+  margin-inline-start: 1.5em;
   padding: 0;
 }
 
@@ -48,7 +48,7 @@ ul {
   border: 1px solid ThreeDShadow;
   border-radius: 10px;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   background: transparent;
   background-image: url("chrome://global/skin/icons/conn.png");
   background-position: 25px 50px;
@@ -67,11 +67,11 @@ ul {
 }
 
 #errorTitle {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 #errorLongContent {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 #errorShortDesc > p {
@@ -83,7 +83,7 @@ ul {
 }
 
 #errorLongDesc {
-  -moz-padding-end: 3em;
+  padding-inline-end: 3em;
   font-size: 110%;
 }
 
@@ -92,14 +92,14 @@ ul {
 
 #errorTryAgain {
   margin-top: 2em;
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 #brand {
   position: absolute;
   right: 0;
   bottom: -1.5em;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
   opacity: .4;
 }
 
diff --git a/src/chrome/global/notification.css b/src/chrome/global/notification.css
index d469b77..41365aa 100644
--- a/src/chrome/global/notification.css
+++ b/src/chrome/global/notification.css
@@ -29,8 +29,8 @@ notification[type="critical"] {
 .messageImage {
   width: 16px;
   height: 16px;
-  -moz-margin-start: 6px;
-  -moz-margin-end: 1px;
+  margin-inline-start: 6px;
+  margin-inline-end: 1px;
 }
 
 /* Default icons for notifications */
@@ -54,13 +54,13 @@ notification[type="critical"] .messageImage,
   -moz-appearance: none;
   border: none;
   padding: 0px;
-  -moz-margin-start: 8px;
-  -moz-margin-end: 5px;
+  margin-inline-start: 8px;
+  margin-inline-end: 5px;
 }
 
 popupnotification .messageCloseButton {
   margin-top: -2px;
-  -moz-margin-end: -2px;
+  margin-inline-end: -2px;
 }
 
 #notification-popup .messageCloseButton {
@@ -93,12 +93,12 @@ popupnotification .messageCloseButton {
 }
 
 .popup-notification-menubutton > .button-menubutton-button > .button-box {
-  -moz-padding-start: 8px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 8px;
+  padding-inline-end: 5px;
 }
 
 .popup-notification-menubutton > .button-menubutton-dropmarker {
-  -moz-border-start-style: none !important;
+  border-inline-start-style: none !important;
   padding: 2px 3px 2px;
   width: auto;
   height: auto;
@@ -168,7 +168,7 @@ popupnotification .messageCloseButton {
 }
 
 .popup-notification-closebutton {
-  -moz-margin-end: -14px;
+  margin-inline-end: -14px;
   margin-top: -10px;
 }
 
diff --git a/src/chrome/global/passwordmgr.css b/src/chrome/global/passwordmgr.css
index 98b2bcf..774f2a5 100644
--- a/src/chrome/global/passwordmgr.css
+++ b/src/chrome/global/passwordmgr.css
@@ -49,5 +49,5 @@ treechildren::-moz-tree-image(siteCol) {
   list-style-image: url(chrome://mozapps/skin/places/defaultFavicon.png);
   width: 16px;
   height: 16px;
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
 }
diff --git a/src/chrome/global/preferences.css b/src/chrome/global/preferences.css
index 03570c4..47a331b 100644
--- a/src/chrome/global/preferences.css
+++ b/src/chrome/global/preferences.css
@@ -50,15 +50,15 @@ prefwindow {
 prefpane {
   padding-top: 8px;
   padding-bottom: 10px;
-  -moz-padding-start: 8px;
-  -moz-padding-end: 10px;
+  padding-inline-start: 8px;
+  padding-inline-end: 10px;
 }
 
 prefwindow[type="child"] {
   padding-top: 8px;
   padding-bottom: 10px;
-  -moz-padding-start: 8px;
-  -moz-padding-end: 10px;
+  padding-inline-start: 8px;
+  padding-inline-end: 10px;
 }
 
 prefwindow[type="child"] > prefpane {
@@ -67,8 +67,8 @@ prefwindow[type="child"] > prefpane {
 
 .prefWindow-dlgbuttons {
   padding-bottom: 10px;
-  -moz-padding-start: 8px;
-  -moz-padding-end: 10px;
+  padding-inline-start: 8px;
+  padding-inline-end: 10px;
 }
 
 prefwindow[type="child"] .prefWindow-dlgbuttons {
@@ -85,7 +85,7 @@ radio[pane] {
 .paneSelector {
   border-bottom: 2px groove ThreeDFace;
   margin: 0px;
-  -moz-padding-start: 10px;
+  padding-inline-start: 10px;
   background-color: -moz-Field;
   color: -moz-FieldText;
 }
diff --git a/src/chrome/global/radio.css b/src/chrome/global/radio.css
index f1a7895..3c40ef7 100644
--- a/src/chrome/global/radio.css
+++ b/src/chrome/global/radio.css
@@ -16,18 +16,18 @@ radio {
   margin: 2px 4px;
   padding-top: 1px;
   padding-bottom: 1px;
-  -moz-padding-start: 4px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 4px;
+  padding-inline-end: 2px;
 }
 
 .radio-label-box {
-  -moz-margin-start: 4px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 4px;
+  margin-inline-end: 2px;
   border: 1px solid transparent;
 }
 
 .radio-icon {
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
 }
 
 .radio-label {
diff --git a/src/chrome/global/scrollbox.css b/src/chrome/global/scrollbox.css
index ca267ff..abcb178 100644
--- a/src/chrome/global/scrollbox.css
+++ b/src/chrome/global/scrollbox.css
@@ -74,8 +74,8 @@ autorepeatbutton,
   -moz-box-pack: center;
   margin-top: 1px;
   margin-bottom: 2px;
-  -moz-margin-start: 1px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 1px;
+  margin-inline-end: 2px;
 }
 
 autorepeatbutton {
@@ -89,6 +89,6 @@ autorepeatbutton:not([disabled="true"]):hover:active {
   border: 1px inset transparent;
   padding-top: 2px;
   padding-bottom: 1px;
-  -moz-padding-start: 2px;
-  -moz-padding-end: 1px;
+  padding-inline-start: 2px;
+  padding-inline-end: 1px;
 }
diff --git a/src/chrome/global/textbox.css b/src/chrome/global/textbox.css
index 4d00a91..becebfa 100644
--- a/src/chrome/global/textbox.css
+++ b/src/chrome/global/textbox.css
@@ -22,7 +22,7 @@ textbox {
   box-shadow: 0px 1px 1px #F0F0F0 inset;
   border: 1px solid #9F9C95;
   padding: 1px;
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
   background-color: #FFFFFF;
   color: -moz-FieldText;
   transition: background-color .02s,
diff --git a/src/chrome/global/toolbar.css b/src/chrome/global/toolbar.css
index 4e98770..f955911 100644
--- a/src/chrome/global/toolbar.css
+++ b/src/chrome/global/toolbar.css
@@ -30,8 +30,8 @@ toolbarpaletteitem[place="toolbar"] > toolbarspacer {
 .toolbarpaletteitem-box[type="spring"][place="toolbar"] {
   margin-top: 2px;
   margin-bottom: 2px;
-  -moz-margin-start: 0px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 0px;
+  margin-inline-end: 2px;
 }
 
 .toolbarpaletteitem-box[type="separator"][place="palette"] {
diff --git a/src/chrome/global/toolbarbutton.css b/src/chrome/global/toolbarbutton.css
index 4c53f76..48e9255 100644
--- a/src/chrome/global/toolbarbutton.css
+++ b/src/chrome/global/toolbarbutton.css
@@ -23,7 +23,7 @@ toolbarbutton {
 
 .toolbarbutton-icon[label]:not([label=""]),
 .toolbarbutton-icon[type="menu"] {
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
 }
 
 .toolbarbutton-text {
@@ -53,8 +53,8 @@ toolbarbutton[open="true"] {
   border-color: ThreeDShadow ThreeDHighlight ThreeDHighlight ThreeDShadow;
   padding-top: 4px;
   padding-bottom: 2px;
-  -moz-padding-start: 4px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 4px;
+  padding-inline-end: 2px;
 }
 
 toolbarbutton[disabled="true"] {
@@ -73,8 +73,8 @@ toolbarbutton[checked="true"]:not([disabled="true"]) {
   border-color: ThreeDShadow ThreeDHighlight ThreeDHighlight ThreeDShadow;
   padding-top: 4px;
   padding-bottom: 2px;
-  -moz-padding-start: 4px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 4px;
+  padding-inline-end: 2px;
   background-color: rgba(255,255,255,0.5);
   color: ButtonText;
 }
@@ -108,8 +108,8 @@ toolbarbutton[checked="true"]:not([disabled="true"]) {
   border: none !important;
   background-color: transparent !important;
   padding: 0;
-  -moz-margin-start: 1px;
-  -moz-margin-end: -2px;
+  margin-inline-start: 1px;
+  margin-inline-end: -2px;
   width: auto;
   height: auto;
 }
diff --git a/src/chrome/global/tree.css b/src/chrome/global/tree.css
index 4ef6bfa..a2465f7 100644
--- a/src/chrome/global/tree.css
+++ b/src/chrome/global/tree.css
@@ -163,7 +163,7 @@ treechildren::-moz-tree-drop-feedback {
   background-color: Highlight;
   width: 50px;
   height: 2px;
-  -moz-margin-start: 5px;
+  margin-inline-start: 5px;
 }
 
 /* ::::: tree progress meter ::::: */
@@ -225,7 +225,7 @@ treecolpicker:hover:active {
 }
 
 treecols {
-  -moz-margin-end: -1px;
+  margin-inline-end: -1px;
 }
 
 .treecol-text {
@@ -260,11 +260,11 @@ treecol[insertbefore="true"]:-moz-locale-dir(ltr) {
 }
 
 treechildren::-moz-tree-column(insertbefore) {
-  -moz-border-start: 1px solid ThreeDShadow;
+  border-inline-start: 1px solid ThreeDShadow;
 }
 
 treechildren::-moz-tree-column(insertafter) {
-  -moz-border-end: 1px solid ThreeDShadow;
+  border-inline-end: 1px solid ThreeDShadow;
 }
 
 /* ::::: sort direction indicator :::::  */
@@ -299,7 +299,7 @@ treecol:not([hideheader="true"]) > .treecol-sortdirection[sortDirection="descend
 /* ::::: twisty :::::  */
 
 treechildren::-moz-tree-twisty {
-  -moz-padding-end: 4px;
+  padding-inline-end: 4px;
   width: 8px; /* The image's width is 9 pixels */
   list-style-image: url("chrome://global/skin/tree/twisty-clsd.png");
 }
@@ -343,7 +343,7 @@ treechildren::-moz-tree-cell-text(selected, editing) {
   -moz-border-left-colors: Highlight;
   -moz-border-right-colors: Highlight;
   margin: 0;
-  -moz-margin-start: -4px;
+  margin-inline-start: -4px;
   padding: 1px;
 }
 
@@ -354,7 +354,7 @@ treechildren::-moz-tree-indentation {
 }
 
 treechildren::-moz-tree-twisty {
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
   width: 8px;
 }
 
diff --git a/src/chrome/global/wizard.css b/src/chrome/global/wizard.css
index 5523da9..0a3cf8b 100644
--- a/src/chrome/global/wizard.css
+++ b/src/chrome/global/wizard.css
@@ -15,17 +15,17 @@ wizard[description=""] .wizard-header-description {
 }
 
 .wizard-header-label {
-  -moz-margin-start: 23px;
+  margin-inline-start: 23px;
   font-weight: bold;
 }
 
 .wizard-header-description {
-  -moz-margin-start: 44px;
+  margin-inline-start: 44px;
 }
 
 wizard[branded="true"] .wizard-header-icon {
   list-style-image: url("chrome://branding/content/icon48.png");
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
 }
 
 .wizard-page-box {
diff --git a/src/chrome/mozapps/downloads/downloads.css b/src/chrome/mozapps/downloads/downloads.css
index 4d6cf32..4084bd0 100644
--- a/src/chrome/mozapps/downloads/downloads.css
+++ b/src/chrome/mozapps/downloads/downloads.css
@@ -120,12 +120,12 @@ richlistitem[type="download"] .dateTime {
   }
 
   #clearListButton {
-    -moz-margin-start: 0;
+    margin-inline-start: 0;
     margin-bottom: 0;
   }
 
   #searchbox {
-    -moz-margin-end: 0;
+    margin-inline-end: 0;
     margin-bottom: 0;
   }
 }
diff --git a/src/chrome/mozapps/downloads/unknownContentType.css b/src/chrome/mozapps/downloads/unknownContentType.css
index c6dba24..0682146 100644
--- a/src/chrome/mozapps/downloads/unknownContentType.css
+++ b/src/chrome/mozapps/downloads/unknownContentType.css
@@ -16,16 +16,16 @@
   width: 16px;
   margin-top: 0px;
   margin-bottom: 0px;
-  -moz-margin-start: 0px;
-  -moz-margin-end: 5px;
+  margin-inline-start: 0px;
+  margin-inline-end: 5px;
 }
 
 .small-indent {
-  -moz-margin-start: 15px; 
-  -moz-margin-end: 15px;
+  margin-inline-start: 15px; 
+  margin-inline-end: 15px;
 }
 
 .small-indent label {
-  -moz-margin-start: 0px; 
+  margin-inline-start: 0px; 
 }
 
diff --git a/src/chrome/mozapps/extensions/about.css b/src/chrome/mozapps/extensions/about.css
index 059be87..91ee272 100644
--- a/src/chrome/mozapps/extensions/about.css
+++ b/src/chrome/mozapps/extensions/about.css
@@ -30,7 +30,7 @@
   list-style-image: url("chrome://mozapps/skin/extensions/extensionGeneric.png");
   max-width: 64px;
   max-height: 64px;
-  -moz-margin-end: 6px;
+  margin-inline-end: 6px;
 }
 
 #genericAbout[addontype="theme"] #extensionIcon {
@@ -72,7 +72,7 @@
 }
 
 .boxIndent {
-  -moz-margin-start: 18px;
+  margin-inline-start: 18px;
 }
 
 #extensionCreator, .contributor {
diff --git a/src/chrome/mozapps/extensions/blocklist.css b/src/chrome/mozapps/extensions/blocklist.css
index 5599e92..db5a127 100644
--- a/src/chrome/mozapps/extensions/blocklist.css
+++ b/src/chrome/mozapps/extensions/blocklist.css
@@ -1,8 +1,8 @@
 richlistitem {
   padding-top: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 7px;
-  -moz-padding-end: 7px;
+  padding-inline-start: 7px;
+  padding-inline-end: 7px;
   border-bottom: 1px solid #C0C0C0;
 }
 
diff --git a/src/chrome/mozapps/extensions/eula.css b/src/chrome/mozapps/extensions/eula.css
index eb77668..25c8da5 100644
--- a/src/chrome/mozapps/extensions/eula.css
+++ b/src/chrome/mozapps/extensions/eula.css
@@ -2,7 +2,7 @@
   list-style-image: url("chrome://mozapps/skin/extensions/extensionGeneric.png");
   max-width: 48px;
   max-height: 48px;
-  -moz-margin-end: 6px;
+  margin-inline-end: 6px;
 }
 
 #eula-dialog[addontype="theme"] #icon {
diff --git a/src/chrome/mozapps/extensions/extensions.css b/src/chrome/mozapps/extensions/extensions.css
index 7826d9d..e5ea1ea 100644
--- a/src/chrome/mozapps/extensions/extensions.css
+++ b/src/chrome/mozapps/extensions/extensions.css
@@ -28,8 +28,8 @@
 
 .nav-button {
   list-style-image: url(chrome://mozapps/skin/extensions/navigation.png);
-  -moz-margin-start: 0;
-  -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
   padding: 1px 5px;
   -moz-appearance: none !important;
   background: transparent !important;
@@ -218,7 +218,7 @@
 #categories {
   -moz-appearance: none;
   border: none;
-  -moz-margin-end: -1px;
+  margin-inline-end: -1px;
   background-color: transparent;
   position: relative;
   margin-top: 31px;
@@ -266,7 +266,7 @@
   background-color: #FFFFFF;
   color: #000000;
   border-color: #9E9E9E;
-  -moz-border-end-color: #FFFFFF;
+  border-inline-end-color: #FFFFFF;
   box-shadow: 0 1px 3px 2px #DEDEDE;
 }
 
@@ -298,7 +298,7 @@
 .category-icon {
   width: 32px;
   height: 32px;
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
 }
 
 #category-search > .category-icon {
@@ -359,7 +359,7 @@
 #header-utils-btn {
   list-style-image: url("chrome://mozapps/skin/extensions/utilities.png");
   -moz-image-region: rect(0, 18px, 18px, 0);
-  -moz-margin-end: 16px;
+  margin-inline-end: 16px;
   -moz-appearance: none !important;
   background: transparent !important;
   border: 0px solid transparent !important;
@@ -437,7 +437,7 @@
 }
 
 .sorter .button-icon {
-  -moz-margin-start: 4px;
+  margin-inline-start: 4px;
 }
 
 
@@ -455,7 +455,7 @@
 
 .discover-logo {
   list-style-image: url("chrome://mozapps/skin/extensions/discover-logo.png");
-  -moz-margin-end: 15px;
+  margin-inline-end: 15px;
 }
 
 .discover-title {
@@ -499,7 +499,7 @@
   background: transparent;
   box-shadow: none;
   min-width: 13px;
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
   list-style-image: url("chrome://mozapps/skin/extensions/detail-btn.png");
   -moz-image-region: rect(0px, 13px, 13px, 0px);
 }
@@ -569,7 +569,7 @@
 }
 
 .description-container {
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
   -moz-box-align: center;
 }
 
@@ -580,7 +580,7 @@
 .warning,
 .pending,
 .error {
-  -moz-margin-start: 48px;
+  margin-inline-start: 48px;
   font-weight: bold;
   -moz-box-align: center;
 }
@@ -641,7 +641,7 @@
 
 .addon .relnotes-container {
   -moz-box-align: start;
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
   height: 0;
   overflow: hidden;
   opacity: 0;
@@ -672,7 +672,7 @@
 }
 
 .addon .relnotes-toggle > .button-box > .button-icon {
-  -moz-padding-start: 4px;
+  padding-inline-start: 4px;
 }
 
 .addon[show-relnotes] .relnotes-toggle {
@@ -833,12 +833,12 @@
 #detail-notifications .warning,
 #detail-notifications .pending,
 #detail-notifications .error {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 #detail-icon-container {
   width: 64px;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
   margin-top: 6px;
 }
 
@@ -856,7 +856,7 @@
 }
 
 #detail-screenshot {
-  -moz-margin-end: 2em;
+  margin-inline-end: 2em;
   max-width: 300px;
   max-height: 300px;
 }
@@ -879,7 +879,7 @@
 }
 
 #detail-desc, #detail-fulldesc {
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
   /* This is necessary to fix layout issues with multi-line descriptions, see
      bug 592712*/
   outline: solid transparent;
@@ -926,7 +926,7 @@
 }
 
 #detail-contrib-btn .button-icon {
-  -moz-margin-end: 3px;
+  margin-inline-end: 3px;
 }
 
 #detail-contrib-btn:not(:active):hover {
@@ -997,7 +997,7 @@ setting {
   font-size: 90.9%;
   color: graytext;
   margin-top: -2px;
-  -moz-margin-start: 2em;
+  margin-inline-start: 2em;
   white-space: pre-wrap;
 }
 
@@ -1016,8 +1016,8 @@ menulist { /* Fixes some styling inconsistencies */
 /*** creator ***/
 
 .creator > label {
-  -moz-margin-start: 0;
-  -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
 }
 
 .creator > .text-link {
@@ -1029,7 +1029,7 @@ menulist { /* Fixes some styling inconsistencies */
 /*** rating ***/
 
 .meta-rating {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
   padding-top: 2px;
 }
 
@@ -1081,13 +1081,13 @@ menulist { /* Fixes some styling inconsistencies */
 }
 
 .download-progress .start-cap {
-  -moz-margin-start: -1px;
-  -moz-border-end-width: 0;
+  margin-inline-start: -1px;
+  border-inline-end-width: 0;
 }
 
 .download-progress .end-cap {
-  -moz-margin-end: -1px;
-  -moz-border-start-width: 0px !important;
+  margin-inline-end: -1px;
+  border-inline-start-width: 0px !important;
 }
 
 .download-progress .progress .progress-bar  {
@@ -1148,7 +1148,7 @@ menulist { /* Fixes some styling inconsistencies */
 }
 
 .download-progress .cancel .button-icon {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 .download-progress .cancel {
diff --git a/src/chrome/mozapps/extensions/newaddon.css b/src/chrome/mozapps/extensions/newaddon.css
index 19f89f5..cbf3017 100644
--- a/src/chrome/mozapps/extensions/newaddon.css
+++ b/src/chrome/mozapps/extensions/newaddon.css
@@ -68,7 +68,7 @@
 }
 
 #icon {
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
   max-width: 64px;
   max-height: 64px;
   list-style-image: url("chrome://mozapps/skin/extensions/extensionGeneric.png");
@@ -111,11 +111,11 @@
   list-style-image: url("chrome://mozapps/skin/extensions/alerticon-warning.png");
   width: 16px;
   height: 15px;
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
 }
 
 #allow {
-  -moz-margin-start: 84px;
+  margin-inline-start: 84px;
   margin-bottom: 20px;
 }
 
diff --git a/src/chrome/mozapps/extensions/selectAddons.css b/src/chrome/mozapps/extensions/selectAddons.css
index a62217c..9336aff 100644
--- a/src/chrome/mozapps/extensions/selectAddons.css
+++ b/src/chrome/mozapps/extensions/selectAddons.css
@@ -139,8 +139,8 @@
   margin: 0;
   padding-top: 1px;
   padding-bottom: 2px;
-  -moz-padding-start: 6px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 6px;
+  padding-inline-end: 5px;
 }
 
 #select-grid separator {
@@ -176,7 +176,7 @@
 
 .action-list {
   margin-top: 10px;
-  -moz-margin-start: 5em;
+  margin-inline-start: 5em;
 }
 
 .action-header {
@@ -184,7 +184,7 @@
 }
 
 #confirm .addon {
-  -moz-margin-start: 3em;
+  margin-inline-start: 3em;
   -moz-box-align: center;
 }
 
diff --git a/src/chrome/mozapps/extensions/update.css b/src/chrome/mozapps/extensions/update.css
index c20c5e5..773c68f 100644
--- a/src/chrome/mozapps/extensions/update.css
+++ b/src/chrome/mozapps/extensions/update.css
@@ -8,8 +8,8 @@
   height: 16px;
   margin-top: 5px;
   margin-bottom: 5px;
-  -moz-margin-start: 5px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 5px;
+  margin-inline-end: 2px;
 }
 
 .alertBox {
diff --git a/src/chrome/mozapps/handling/handling.css b/src/chrome/mozapps/handling/handling.css
index 688a8dd..7ddef09 100644
--- a/src/chrome/mozapps/handling/handling.css
+++ b/src/chrome/mozapps/handling/handling.css
@@ -5,7 +5,7 @@
 
 richlistitem[type] {
   min-height: 36px; /* Don't forget to update the richlistbox height! */
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
  }
  
 richlistitem {
diff --git a/src/chrome/mozapps/update/updates.css b/src/chrome/mozapps/update/updates.css
index c5c4fe6..d1997e3 100644
--- a/src/chrome/mozapps/update/updates.css
+++ b/src/chrome/mozapps/update/updates.css
@@ -42,8 +42,8 @@ wizardpage {
 }
 
 #licenseContent, #incompatibleListbox {
-  -moz-margin-start: 6px;
-  -moz-margin-end: 6px;
+  margin-inline-start: 6px;
+  margin-inline-end: 6px;
 }
 
 .inline-link {
@@ -57,8 +57,8 @@ wizardpage {
 
 /* Unsupported Page */
 #unsupportedLabel, #unsupportedLinkLabel {
-  -moz-margin-start: 0;
-  -moz-padding-start: 0;
+  margin-inline-start: 0;
+  padding-inline-start: 0;
 }
 
 /* Update Found Basic Page */
@@ -144,8 +144,8 @@ wizardpage {
 #errorReason {
   margin-top: 1px;
   margin-bottom: 2px;
-  -moz-margin-start: 6px !important;
-  -moz-margin-end: 5px;
+  margin-inline-start: 6px !important;
+  margin-inline-end: 5px;
   font-weight: bold;
 }
 
diff --git a/src/chrome/mozapps/xpinstall/xpinstallConfirm.css b/src/chrome/mozapps/xpinstall/xpinstallConfirm.css
index e6a3e0d..6d62eec 100644
--- a/src/chrome/mozapps/xpinstall/xpinstallConfirm.css
+++ b/src/chrome/mozapps/xpinstall/xpinstallConfirm.css
@@ -12,7 +12,7 @@
 }
 
 #itemWarningIntro {
-  -moz-margin-start: 8px;
+  margin-inline-start: 8px;
 }
 
 #dialogContentBox {
@@ -22,8 +22,8 @@
 installitem {
   padding-top: 5px;
   padding-bottom: 5px;
-  -moz-padding-start: 5px;
-  -moz-padding-end: 0;
+  padding-inline-start: 5px;
+  padding-inline-end: 0;
   border-bottom: 1px dotted #9F9F9F;
   margin-bottom: 5px;
 }
@@ -32,7 +32,7 @@ installitem {
   list-style-image: url("chrome://global/skin/icons/warning-large.png");
   width: 48px;
   height: 48px;
-  -moz-margin-end: 20px;
+  margin-inline-end: 20px;
 }
 
 .warning {
@@ -44,7 +44,7 @@ installitem {
 .xpinstallIconContainer {
   width: 32px;
   height: 32px;
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
 }
 
 .xpinstallItemName {
@@ -64,8 +64,8 @@ installitem {
   color: -moz-FieldText;
   margin-top: 1px;
   margin-bottom: 1px;
-  -moz-margin-start: 6px;
-  -moz-margin-end: 5px;
+  margin-inline-start: 6px;
+  margin-inline-end: 5px;
 }
 
 .xpinstallItemIcon {
diff --git a/src/chrome/os/darwin/menu.css b/src/chrome/os/darwin/menu.css
index 16bbc0a..502895a 100644
--- a/src/chrome/os/darwin/menu.css
+++ b/src/chrome/os/darwin/menu.css
@@ -66,12 +66,12 @@ menuitem.spell-suggestion {
 .menu-text {
   -moz-appearance: none;
   font-weight: inherit;
-  -moz-padding-start: 2.2em !important;
+  padding-inline-start: 2.2em !important;
 }
 
 .menu-iconic-text {
   font-weight: inherit;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
 }
 
 menucaption > .menu-text,
@@ -83,21 +83,21 @@ menucaption > .menu-iconic-text {
 .menu-description {
   font-style: italic;
   color: GrayText;
-  -moz-margin-start: 1ex !important;
+  margin-inline-start: 1ex !important;
 }
 
 .menu-accel,
 .menu-iconic-accel {
   color: #666666;
-  -moz-margin-start: 0.74em !important;
-  -moz-margin-end: 1em !important;
+  margin-inline-start: 0.74em !important;
+  margin-inline-end: 1em !important;
 }
 
 .menu-iconic-left {
   min-width: 1.45em;
   margin-top: -1px !important;
-  -moz-margin-end: 6px !important;
-  -moz-margin-start: 4px !important;
+  margin-inline-end: 6px !important;
+  margin-inline-start: 4px !important;
 }
 
 .menu-iconic-icon {
@@ -110,7 +110,7 @@ menucaption > .menu-iconic-text {
 .menu-right {
   -moz-appearance: none;
   margin-top: -1px;
-  -moz-margin-end: -1px;
+  margin-inline-end: -1px;
   min-width: 1.28em;
   list-style-image: url("chrome://global/skin/icons/menu_more.png");
   -moz-image-region: rect(0, 16px, 16px, 0);
@@ -206,8 +206,8 @@ menulist > menupopup > menucaption,
 menulist > menupopup > menu {
   -moz-appearance: none;
   border: 1px solid transparent;
-  -moz-padding-start: 5px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 5px;
+  padding-inline-end: 5px;
   max-width: none;
   color: -moz-FieldText;
 }
diff --git a/src/chrome/os/darwin/popup.css b/src/chrome/os/darwin/popup.css
index 8dbd60a..1020b6c 100644
--- a/src/chrome/os/darwin/popup.css
+++ b/src/chrome/os/darwin/popup.css
@@ -102,7 +102,7 @@ panel[type="arrow"][side="right"] {
 tooltip {
   -moz-appearance: none;
   margin-top: 16px;
-  -moz-margin-start: -5px;
+  margin-inline-start: -5px;
   border: 1px solid InfoText;
   padding: 2px 3px;
   max-width: 40em;
diff --git a/src/chrome/os/winnt/browser.css b/src/chrome/os/winnt/browser.css
index 453bae5..e5074b1 100644
--- a/src/chrome/os/winnt/browser.css
+++ b/src/chrome/os/winnt/browser.css
@@ -82,11 +82,11 @@ menupopup {
   height: auto;
   padding: 0;
   margin: 0;
-  -moz-margin-start: .5em;
+  margin-inline-start: .5em;
 }
 
 #appmenuPrimaryPane {
-  -moz-border-end: 1px solid #DCDCDC;
+  border-inline-end: 1px solid #DCDCDC;
   padding-right: 1px;
   box-shadow: 1px 0 0 #FFFFFF;
   position: relative;
@@ -96,7 +96,7 @@ menupopup {
 }
 
 #appmenuSecondaryPane {
-  -moz-padding-start: 1px;
+  padding-inline-start: 1px;
   background: #EFEFEF;
   font-family: "Segoe UI Semibold", "Segoe UI", sans-serif;
 }
@@ -140,7 +140,7 @@ menupopup {
 
 @media not all and (-moz-windows-classic) {
   #titlebar-min {
-    -moz-margin-end: 2px;
+    margin-inline-end: 2px;
   }
 }
 
@@ -821,7 +821,7 @@ menupopup {
     content: "";
     display: block;
     margin-top: -15px;
-    -moz-margin-start: -2px;
+    margin-inline-start: -2px;
     padding: 0;
     width: 32px;
     height: 7px;
diff --git a/src/chrome/os/winnt/menu.css b/src/chrome/os/winnt/menu.css
index 16bbc0a..502895a 100644
--- a/src/chrome/os/winnt/menu.css
+++ b/src/chrome/os/winnt/menu.css
@@ -66,12 +66,12 @@ menuitem.spell-suggestion {
 .menu-text {
   -moz-appearance: none;
   font-weight: inherit;
-  -moz-padding-start: 2.2em !important;
+  padding-inline-start: 2.2em !important;
 }
 
 .menu-iconic-text {
   font-weight: inherit;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
 }
 
 menucaption > .menu-text,
@@ -83,21 +83,21 @@ menucaption > .menu-iconic-text {
 .menu-description {
   font-style: italic;
   color: GrayText;
-  -moz-margin-start: 1ex !important;
+  margin-inline-start: 1ex !important;
 }
 
 .menu-accel,
 .menu-iconic-accel {
   color: #666666;
-  -moz-margin-start: 0.74em !important;
-  -moz-margin-end: 1em !important;
+  margin-inline-start: 0.74em !important;
+  margin-inline-end: 1em !important;
 }
 
 .menu-iconic-left {
   min-width: 1.45em;
   margin-top: -1px !important;
-  -moz-margin-end: 6px !important;
-  -moz-margin-start: 4px !important;
+  margin-inline-end: 6px !important;
+  margin-inline-start: 4px !important;
 }
 
 .menu-iconic-icon {
@@ -110,7 +110,7 @@ menucaption > .menu-iconic-text {
 .menu-right {
   -moz-appearance: none;
   margin-top: -1px;
-  -moz-margin-end: -1px;
+  margin-inline-end: -1px;
   min-width: 1.28em;
   list-style-image: url("chrome://global/skin/icons/menu_more.png");
   -moz-image-region: rect(0, 16px, 16px, 0);
@@ -206,8 +206,8 @@ menulist > menupopup > menucaption,
 menulist > menupopup > menu {
   -moz-appearance: none;
   border: 1px solid transparent;
-  -moz-padding-start: 5px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 5px;
+  padding-inline-end: 5px;
   max-width: none;
   color: -moz-FieldText;
 }
diff --git a/src/chrome/os/winnt/menulist.css b/src/chrome/os/winnt/menulist.css
index 61b8ced..cc17ebd 100644
--- a/src/chrome/os/winnt/menulist.css
+++ b/src/chrome/os/winnt/menulist.css
@@ -39,15 +39,15 @@ menulist {
 
 .menulist-label {
   margin-top: 0 !important;
-  -moz-margin-end: 0 !important;
+  margin-inline-end: 0 !important;
   margin-bottom: 0 !important;
-  -moz-margin-start: 1px !important;
+  margin-inline-start: 1px !important;
 }
 
 .menulist-description {
   font-style: italic;
   color: GrayText;
-  -moz-margin-start: 1ex !important;
+  margin-inline-start: 1ex !important;
 }
 
 /* ..... dropmarker ..... */
@@ -67,8 +67,8 @@ menulist:hover:active > .menulist-dropmarker {
   -moz-border-left-colors: ThreeDShadow ThreeDFace;
   padding-top: 2px;
   padding-bottom: 0px;
-  -moz-padding-start: 2px;
-  -moz-padding-end: 0px;
+  padding-inline-start: 2px;
+  padding-inline-end: 0px;
 }
 
 /* ..... focused state ..... */
@@ -94,8 +94,8 @@ menulist[disabled="true"] {
 .menulist-editable-box {
   padding-top: 3px;
   padding-bottom: 3px;
-  -moz-padding-start: 2px;
-  -moz-padding-end: 0px;
+  padding-inline-start: 2px;
+  padding-inline-end: 0px;
 }
 
 html|*.menulist-editable-input {
@@ -128,7 +128,7 @@ html|*.menulist-editable-input {
 }  
 
 .menulist-compact > .menulist-label-box > .menulist-icon {
-  -moz-margin-start: 2px;
+  margin-inline-start: 2px;
 }
 
 .menulist-compact[open="true"] {
diff --git a/src/chrome/os/winnt/popup.css b/src/chrome/os/winnt/popup.css
index 6d47222..c9ebc42 100644
--- a/src/chrome/os/winnt/popup.css
+++ b/src/chrome/os/winnt/popup.css
@@ -40,7 +40,7 @@ menupopup {
 
 menupopup > menu > menupopup {
  /* align submenus */
-  -moz-margin-start: -3px;
+  margin-inline-start: -3px;
   margin-top: -3px;
 }
 
@@ -128,7 +128,7 @@ panel[type="arrow"][side="right"] {
 tooltip {
   -moz-appearance: none;
   margin-top: 16px;
-  -moz-margin-start: -5px;
+  margin-inline-start: -5px;
   border: 1px solid InfoText;
   padding: 2px 3px;
   max-width: 40em;