Firefox user's browser tab crashes when someone stops sharing their screen.

[filip-ams]

We noticed this bug when during our Documentation meeting Yash stopped sharing his screen, and later confirmed that it was related to Firefox when Burak tried to join with both Opera and Firefox and managed to reproduce it on Firefox.

When trying to view the console after the crash I couldn't open the page inspector (It is just blank, you can see in the screenshot):

[burak-58]

Further observations:

• It also happens with conference.html with the following scenario

  • Open 3 tabs and join the same room:
    http://localhost:5080/LiveApp/conference.html?streamId=burak
    http://localhost:5080/LiveApp/conference.html?streamId=melik
    http://localhost:5080/LiveApp/conference.html?streamId=tuna
  • Check the streamer id for the videotrack0 in the first tab
  • Switch the tab for that streamer and click Leave
  • First tab will crash

• The scenario above doesn't work with 2 participants

• If you have 4 participants again the streamer of videotrack0 causes the issue only

• In Firefox the obj.stream.onremovetrack callback is not fired