1724663 - YouTube videos glitch out on the bottom half when when privacy.resistFingerprinting is enabled

Status: NEW

(Core :: DOM: Security, defect, P3)

Description

[Asif Youssuff]

Attachment: image.png

From https://www.reddit.com/r/firefox/comments/p0tryk/youtube_videos_glitch_out_on_the_bottom_half/

Happens on any youtube video, any.

I just noticed that the glitch is part of the youtube overaly (the one with the playback controls and such). Playing the video and then waiting a few seconds for it to go away works fine.

See screenshot.

Video: https://streamable.com/7efdj2

Disabling HW WebRender doesn't change anything.

User confirms that this is solved when when privacy.resistFingerprinting is disabled.

Comment 1

[Asif Youssuff]

Attachment: about:support

Comment 2

[Tom Ritter [:tjr]]

Thanks for this. This is consistent with the randomized canvas rendering we did. Hopefully we will soon get software rendering with canvas working and can do away with all the canvas annoyances.

Comment 3

[Eray Erdin]

Attachment: 2022-09-06_00-25.png

Operating System: Fedora Linux 36
KDE Plasma Version: 5.25.4
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5
Kernel Version: 5.19.6-200.fc36.x86_64 (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-2400 CPU @ 3.10GHz
Memory: 15,6 GiB of RAM
Graphics Processor: AMD OLAND

Firefox install method: Flathub

Comment 4

[Eray Erdin]

A comment on why anyone would like to enable this config in the first place: Oddly, pressing <kbd>F</kbd> does not make the video fullscreen in Firefox while it does in Chrome.

This page suggests to do it in order to get it working.

Comment 5

[juliangarner240]

I still have this bug in Firefox 122.0.1, the bug is still present when full screening, and setting privacy.resistFingerprinting to false resolves the issue, however, I do not see that as a suitable long-term solution.

Comment 6

[juliangarner240]

and re-enabling it after I disabled it to test has resolved the issue??