[Bug 2047262] [NEW] Firefox stops inhibiting screensaver after opening/un-suspending two or more tabs with video playback

[Eugene San]

Public bug reported:

After a fresh start of firefox, screen saver is blocked properly when
playing video but after opening/un-suspending a few tabs with video,
inhibition stops working.

I was unable to come up with reproducible scenario but after a few hours
of browsing it usually stops working. Restarting firefox fixes the
problem.

The bug first appeared around August and affects both .deb and snap
packages.

Tested on Ubuntu-Mate 22.04.3, Xorg, both Pulseaudio and Pipewire (if that's relevant).
I don't see any relevant msgs in xsession-errors or system logs.

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

** Summary changed:

- Firefox stops inhibiting screensaver after opening two or more tabs with video playback
+ Firefox stops inhibiting screensaver after opening/un-suspending two or more tabs with video playback

** Description changed:

  After a fresh start of firefox, screen saver is blocked properly when
- playing video but after opening/activating(unsuspending) a few tabs with
- video, inhibition stops working.
+ playing video but after opening/un-suspending a few tabs with video,
+ inhibition stops working.
  
  I was unable to come up with reproducible scenario but after a few hours
  of browsing it usually stops working. Restarting firefox fixes the
  problem.
  
  The bug first appeared around August and affects both .deb and snap
  packages.
  
  Tested on Ubuntu-Mate 22.04.3, Xorg, both Pulseaudio and Pipewire (if that's relevant).
  I don't see any relevant msgs in xsession-errors or system logs.

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https://bugs.launchpad.net/bugs/2047262

Title:
  Firefox stops inhibiting screensaver after opening/un-suspending two
  or more tabs with video playback

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