I can't pinpoint exactly when it started, but Firefox snap in Xubuntu 22.04 does not properly handle the Facebook newsfeed any more. Facebook seems to push content into the feed in the background. On Chromium, the feed continues to display the elements you're reading; other content slots in around it. In Firefox, this push results in a constantly changing barrage of feed posts. It's impossible to read one element because the display jumps around.

Is this a known issue? If yes, is a fix expected?