Screen sharing doesn't work properly with Firefox 80

Description:

Steps to reproduce:

1. Open Firefox
2. Open LibreOffice Impress presentation
3. Menu Bar → Slide Show → Start from First Slide F5
4. Alt+Tab to switch to Firefox, open a room on Jitsi Meet and share the screen Presenting: …
5. When the presentation slides are changed, the other person with Firefox 80.0 (64-bit) only sees one slide, the slides do not change.

Expected behavior:

Screen share should work with Firefox.

Actual behavior:

Screen share does not show slide changes.

Server information:

• Jitsi Meet version: Jitsi Meet
• Operating System: 5th September 2020

Client information:

• Screen share program: LibreOffice 7.0.1.2 Linux (64-bit) (deb)
• Browser / app version: Firefox 80.0 (64-bit)
• Operating System: Linux Mint 20 Cinnamon

Additional information:

• All the participants in the Jitsi Meet Room were hidden, i.e. their video was turned off. Does this help to reproduce?
• Is this a bug introduced with the updated Jitsi Meet program?
• Is this a feature missing in Firefox 80 which the updated Jitsi Meet program requires? https://github.com/jitsi/jitsi-meet/issues/4758
• Also didn’t work when we shared a screen from a different program.
• Worked when Chrome was used by the presenter and the view was using Firefox. However, the sound was not good for the Firefox viewers when their microphones were muted. When the viewer unmuted their microphones, then the sound from the presenter (on Chrome) was fine.

Thank you

[ovari]

Search their bugzilla for a similar report and report it there.

https://bugzilla.mozilla.org/show_bug.cgi?id=1663286

[damencho]

I believe there is nothing we can do for this issue, as this is entirely on the browser side. Search their bugzilla for a similar report and report it there. Does it work with Firefox 79 or any other version?