1834356 - Scrolling and video performance issues in specific website

Status: RESOLVED INVALID

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

Description

[sha-265 [:sha-265]]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/113.0

Steps to reproduce:

Try to use kan.org.il website.

Some pages have a scrolling and video playing performance issues. For example:
https://www.kan.org.il/content/kan/kan-11/%D7%9E%D7%94%D7%A6%D7%93-%D7%94%D7%A9%D7%A0%D7%99-%D7%A2%D7%9D-%D7%92%D7%99%D7%90-%D7%96%D7%94%D7%A8/371885/

Actual results:

Video and scrolling is choppy.

If I'm going full screen for the video, the video is playing smoothly.

Expected results:

Scrolling and video playing should be smooth.

I tried to run FF in troubleshooting mode, and it worked better. After I tried to disable addons manually, but I couldn't find the programmatic addon.

Comment 1

[BugBot [:suhaib / :marco]]

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 2

[Jim Mathies [:jimm]]

Could you help us out by capturing and uploading a Firefox performance profile when this happens? Visit https://profiler.firefox.com/ for more information. When capturing, please select the Media profile in the drop down, upload the resulting profile and post the url here.

Comment 3

[sha-265 [:sha-265]]

(In reply to Jim Mathies [:jimm] from comment #2)

Could you help us out by capturing and uploading a Firefox performance profile when this happens? Visit https://profiler.firefox.com/ for more information. When capturing, please select the Media profile in the drop down, upload the resulting profile and post the url here.

https://share.firefox.dev/45LYiZ2

Comment 4

[BugBot [:suhaib / :marco]]

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

For more information, please visit BugBot documentation.

Comment 5

[Jim Mathies [:jimm]]

Yes you're definitely experiencing some jank in the main process, and it looks extension related. If you don't mind posting your about support, that might help. I'd suggest disabling extensions one at a time to try and track down the bad one.