1986170 - youtube.com - Firefox becomes unresponsive for a while after loading a YouTube video

Status: RESOLVED WORKSFORME

(Core :: Audio/Video: Playback, defect, P3)

Description

[Denys [:denyshon]]

Attachment: Firefox becomes unresponsive for a while after loading a YouTube video

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:142.0) Gecko/20100101 Firefox/142.0

Steps to reproduce:

I can't reproduce it on my other device, so some of the preconditions must be crucial. However, here the issue reproduces itself in a fresh profile. OS: Windows 10, Firefox MSiX 142.0.1. The issue is NOT reproducible in Edge on the same device. So, to reproduce:
Open any video on YouTube and play it (it doesn't matter whether you used YouTube before, whether you have other YouTube tabs opened and whether you are logged in).

Actual results:

Firefox becomes totally unresponsive for about 30 seconds. During that time, the audio is streamed fine, but the fps drops super low, and the UI is almost unresponsive (see the recording).
Please note that the audio has not been recorded.

Expected results:

The video starts playing immediately without any glitches.

Comment 1

[Denys [:denyshon]]

Also, I've been facing this bug for more than a year

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Audio/Video: Playback' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit BugBot documentation.

Comment 4

[jonzn4SUSE]

Attachment: YT_Screenshot_20251125_214632.png

I'm having the same issues on all laptops running 145, but on my 2012 mac running 115.30esr all is well.

Operating System: openSUSE Leap 15.6
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.12
Kernel Version: 6.4.0-150600.23.78-default (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 PRO 6850HS with Radeon Graphics
Memory: 62.1 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: HP
Product Name: HP EliteBook 865 16 inch G9 Notebook PC

Comment 5

[jonzn4SUSE]

Attachment: YT2_Screenshot_20251125_214632.png

Comment 6

[jonzn4SUSE]

Unfortunately for me it looks like an add-on issue. In safe mode it's working normally, but let me go back into normal mode and try to tweak a few things.

Comment 7

[Denys [:denyshon]]

For me, sometimes it works normally, but I can't see any pattern

Comment 8

[Denys [:denyshon]]

And the only add-ons that I still use from that time are Multi-Account Containers, Relay and Grammarly

Comment 9

[Denys [:denyshon]]

The Troubleshoot mode indeed resolves the issue, but:

• It's reproducible in a fresh profile (see above)
• It's reproducible with hardware acceleration disabled

Comment 10

[jonzn4SUSE]

Even restarting the browser after trying YT took about 2 minutes for the browser to come back.

Comment 11

[jonzn4SUSE]

Attachment: YT not working_Screenshot_20251207_130732.png

Just trying to open the page and the tab becomes unresponsive.

Comment 12

[jonzn4SUSE]

That's Nightly. ;-/

Comment 13

[jonzn4SUSE]

I've been on my 2012 mac lately running 115 esr with the same add-ons that are synced on my account and have 0 issues with YouTube.

Comment 14

[Denys [:denyshon]]

Installing a new version of the Intel® Processor Graphics driver resolved the issue. I'm not sure why the old driver broke Firefox only, but I can imagine valid reasons for that.