Comment 10 for bug 1979891

Created attachment 9294363
about:support.json

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:104.0) Gecko/20100101 Firefox/104.0

Steps to reproduce:

Upgraded to snap version of Firefox on Ubuntu, used browser normally.

Actual results:

After a while, scroll bars stop sliding smoothly. I can click on the slider, hold, and move to the desired part of the page, but while doing that there is no animation showing what I'm doing. Hovering over a hyperlink no longer causes the URL to show up at the bottom of the screen. Then when I adjust window size, sometimes the window fails to render inside its boundaries properly. In particular, if I unplug my external monitor (which is in portrait orientation and connected to my laptop via a USB-C port that's converted to HDMI) this forces Firefox windows to redraw on my built-in monitor (which is in landscape orientation) and I immediately experience problems with windows not rendering in their boundaries properly. When a window is in this maladjusted state, the contents don't fill the window, not all the controls are visible, and clicks are offset, so if I click on one spot, the window behaves as if I clicked on a different spot (so it's impossible to use Firefox in that window anymore).

Not all windows are broken, so I can fix this problem for a given window by moving all its tabs to a new window, one by one. Restarting Firefox cures this problem for all windows.

Expected results:

No rendering problems.

FTR, originally reported here, and I was asked to re-report to mozilla.org: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1979891