Firefox support

[lmeyerov]

• stuck fetching
• css container different?
• panel settings dispapear on load, breaking

[lmeyerov]

Load:

Graphistry client: ready for API connection LocalDataSink.js:7:16
received valid postMessage handshake 
Object { data: {…}, cache: undefined, rest: {…} }
cvSandboxMinimal.html:10885:184051
Graphistry API: init filter passed, handling 
Object { target: {…}, cache: undefined, cache2: undefined }
​
cache: undefined
​
cache2: undefined
​
target: Object { … }
​
<prototype>: Object { … }
cvSandboxMinimal.html:10885:184362
Starting iframe protocol listen flow: Load trigger cvSandboxMinimal.html:10885:183532
Starting iframe protocol listen flow: v 
load { target: iframe.graphistry-iframe, isTrusted: true, srcElement: iframe.graphistry-iframe, currentTarget: iframe.graphistry-iframe, eventPhase: 2, bubbles: false, cancelable: false, returnValue: true, defaultPrevented: false, composed: false, … }