This was fixed in the latest update: https://www.mozilla.org/en-US/firefox/134.0.1/releasenotes/ https://www.mozilla.org/en-US/firefox/134.0.1/releasenotes/ Up

This was fixed in the latest update: https://www.mozilla.org/en-US/firefox/134.0.1/releasenotes/ https://www.mozilla.org/en-US/firefox/134.0.1/releasenotes/ Update your firefox now and the issue is gone. It was basically the whole reason for the update. Google changed their code to create a bunch of objects over time, and those objects didn't get cleaned up. It was just a standard memory leak issue. Except it heavily impacted users who kept a youtube tab open or pinned. The bug was reported and a fix released in a little under 2 weeks.