Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More on Release 86 of Firefox/Win64 and newer is causing huge CPU spikes in the Firefox process handling the respective tab when navigating to a different page (in the same tab) on YouTube while a video plays

more options

You can work around the issue by stopping the video currently playing in the YouTube tab before navigating away from its page.

I suspected the usual problem of hardware acceleration / video drivers and Firefox not playing nice, but thanks to the Firefox builds and their version archive, I was able to confirm that it only happens on Release 86 and newer.

Since it's reproducible with the PortableApps builds, settings/profile/cookies etc., it seems pretty clear it's an issue with Firefox proper.

I've downgraded my main Firefox installation to 85.0.2 for the time being and am enjoying snappy YouTube without hangs again.

Anybody happen to know if that bug is already known / under triage or should I get comfortable with the idea of having to downgrade to and using Firefox ESR for a while?

Modified by cybasheep

All Replies (1)

more options

Update: Might be specific to Windows 8.1


Ask a question

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.