Firefox stopped inhibiting screensaver on video playback

Bug #2047262 reported by Eugene San
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
firefox (Ubuntu)
New
Undecided
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Bug Description

Update (02/2024):
With Firefox 122 on Ubuntu-Mate 23.10, screensaver/powermanager inhibition is completely broken even with Mozilla's .deb package.

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.

Eugene San (eugenesan)
summary: - 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: updated
Eugene San (eugenesan)
summary: - Firefox stops inhibiting screensaver after opening/un-suspending two or
- more tabs with video playback
+ Firefox stopped inhibiting screensaver on video playback
description: updated
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