I've just updated my Linux Mint to 22.1 and Firefox to 142 on two computers. Both show the same behaviour. On websites of the Stackexchage family (Stackoverflow, Superuser, Crossvalidated, Academia...) the comment function seems to not work anymore. I am not offered a button to comment, and clicking buttons to see more comments that are already there don't show the comments but rather send me to the top of the page. I can still answer. The problem seems to be with Firefox 142 as it worked well before the update, and it still works well with Firefox 142 on Mac and other browsers on Linux.

This looks like a minor bug, not sure whether it is specific to Stackexchange or other websites are affected, too. Is there any help? If not, where can I file a bug report?