Summary

The screen sharing feature fails due to incompatibility with the Firefox version that the user is running on

Environment

• Mac OS X High Sierra 10.13.1
• Ubuntu 16.0.4
• Mozilla Firefox 57.0
• Mozilla Firefox 58.0.1

Steps to reproduce

1. Launch a group / 1-1 video call from your Firefox web browser
   
2. Click on the screen share button to start sharing your screen. For example:
   

Expected Result

The screen sharing feature should work and the recipients should be able to view the screen of the initiator

Actual Result

• The user will be prompted to install the Firefox extension for screen sharing
  
  
• After clicking Allow, the following error will be displayed
  

Notes

• The issue is reproducible for both group and 1-1 screen sharing feature
• The link where the extension was pointing to refers to jidesha-hipchat:

  $ wget https://d3f5ootf0jzs2j.cloudfront.net/hipchat/jidesha-hipchat-0.1.2-fx.xpi
  --2018-02-08 08:58:57--  https://d3f5ootf0jzs2j.cloudfront.net/hipchat/jidesha-hipchat-0.1.2-fx.xpi
  Resolving d3f5ootf0jzs2j.cloudfront.net... 52.84.225.127, 52.84.225.131, 52.84.225.206, ...
  Connecting to d3f5ootf0jzs2j.cloudfront.net|52.84.225.127|:443... connected.
  HTTP request sent, awaiting response... 200 OK
  Length: 7126 (7.0K) [application/x-xpinstall]
  Saving to: ‘jidesha-hipchat-0.1.2-fx.xpi’
  
  jidesha-hipchat-0.1.2-fx.xpi                       100%[================================================================================================================>]   6.96K  --.-KB/s    in 0s
  
  2018-02-08 08:58:57 (400 MB/s) - ‘jidesha-hipchat-0.1.2-fx.xpi’ saved [7126/7126]
  

• Upon extraction of the .xpi file, we noticed the min and max version (not certain if this refers to the version of Firefox specifically), so we are uncertain if this is actually related to the issue:

      <!-- Mozilla Firefox -->
      <em:targetApplication>
        <Description>
          <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
          <em:minVersion>40.0</em:minVersion>
          <em:maxVersion>48.0</em:maxVersion>
        </Description>
      </em:targetApplication>
    </Description>
  </RDF>
  

• According to the articles below, the extension is no longer needed since Firefox 52:
  • Firefox extension useful?
  • mozilla wiki: Screensharing

    IMPORTANT: The Screensharing whitelist is no longer needed to share your screen or windows starting Firefox 52 (April). Please let us know if you find any problems!