On Thu, 20 Sep 2018 18:21:36 +0200, Hubert Hauser wrote:
Any ideas how to fix this issue?
The first step, before you could fix something, would be troubleshooting. Firefox is broken for me, too, but IMO troubleshooting a Firefox issue isn't worth the effort, since there are many browsers available, that are less painful, than Firefox ever was.
If safe-mode and/or a new profile don't make a difference, for testing purpose consider to run Firefox by a new added user (clean caches, default WM theme etc.).