Freeze/Jank after updating to 130/131 when handling multiple tabs

[robertgr991]

Hello,

In the last 1-2 weeks I experience severe freezing/jank when having multiple tabs open and switching between them. Previously, I didn't have any problem even with 30+ tabs.

After running the profiler with "Firefox" settings applied, I found that the "Parent Process" reports a "Jank" event for the duration of the freeze. See screenshoot below.

Has anyone encountered this? I analyzed the other processes and it doesn't seem to be caused by an extension or a web page.

[robertgr991]

After further testing, this seems to happen when scrolling the Tabs bar at the top. If I scroll the tabs using the new "List all tabs" button or if I use tab switching window, it doesn't happen.