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Screensaver interrupts fullscreen Firefox videos

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No backup, but I made a discovery: In its last update, Firefox "fixed" a bug that displayed the status bar in fullscreen mode.

Fairly certain that this is the cause of the issue. I'll report it to Mozilla. Is there a way to downgrade my Firefox in the meantime, if I don't have a backup?  Thank you.

Do you have a backup of your home folder made before the key date perhaps using Backups aka deja-dup ?
If so, it should be possible to find the about:config from the back up set.

Thank you Steve. I can't say for certain when the problem began, but I think I first noticed it on 11/20. That actually could line up with the 11/14 update, since I was out of town for that week. It's possible that I came home on the 20th, updated everything, and broke it then.

Any way to check?

Firefox updates since August 2023 are listed below.  If you suspect a Firefox update caused it can you tie the start of your symptoms to one of these dates ?

2023-08-21 (116.0.3+build2-0ubuntu0.20.04.1) over (116.0.2+build1-0ubuntu0.20.04.1)
2023-08-30 (117.0+build2-0ubuntu0.20.04.1) over (116.0.3+build2-0ubuntu0.20.04.1)
2023-09-14 (117.0.1+build2-0ubuntu0.20.04.1) over (117.0+build2-0ubuntu0.20.04.1)
2023-10-03 (118.0.1+build1-0ubuntu0.20.04.1) over (117.0.1+build2-0ubuntu0.20.04.1)
2023-10-11 (118.0.2+build2-0ubuntu0.20.04.1) over (118.0.1+build1-0ubuntu0.20.04.1)
2023-10-30 (119.0+build2-0ubuntu0.20.04.1) over (118.0.2+build2-0ubuntu0.20.04.1)
2023-11-14 (119.0.1+build1-0ubuntu0.20.04.1) over (119.0+build2-0ubuntu0.20.04.1)
2023-11-23 (120.0+build2-0ubuntu0.20.04.1) over (119.0.1+build1-0ubuntu0.20.04.1)
2023-12-04 (120.0.1+build1-0ubuntu0.20.04.1) over (120.0+build2-0ubuntu0.20.04.1)

Tried changing all my Power Management settings (disabling & re-enabling screensaver, changing the timeout periods) but no matter what I do, my system will not recognize fullscreen videos in Firefox. It will interrupt them with whatever sleep/suspend/display setting I've picked.

This didn't used to be the case. Previously, if I made a Firefox video full screen, the system would not interrupt it. (I have not tried playing fullscreen videos in any other app. I do all my video watching in Firefox)

Did a Firefox setting change during an update or something? Here's my about:config settings when I search for "Full". Anything here look off?


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