[Bug 1915802] [NEW] No screen sharing on Firefox with Wayland

[Launchpad Bug Tracker]

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On Ubuntu 20.04.2 or 20.10, if I switch to a Wayland session, and open Firefox (currently 85.0.1) on a site using some screen sharing, Firefox does not list the available windows but only a line "Use operating system settings".
After choosing this only option, nothing happens and my screen is not shared.

When using the default Xorg session, Firefox lists the available windows
and allows to share them.

Steps to reproduce :
- open a Wayland session
- open Firefox on https://meet.jit.si/
- start a conference and join it
- try to share your screen (icon of a screen at the bottom left)

Expected behavior : Firefox should ask me which window to share (like on
Xorg)

Actual behavior : Firefox does not list any window, but only a "Use
operating system settings" line, and selecting it does nothing

NB : installing and starting pipewire (as suggested in http://jgrulich.cz/2018/07/04/how-to-enable-and-use-screen-sharing-on-wayland/) does not help
NB2 : the behavior is the same on other sites, like Google Meet

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment wayland
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No screen sharing on Firefox with Wayland
https://bugs.launchpad.net/bugs/1915802
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