Firefox draws only an outline of a window
Hello, for some time Firefox draws only an outline of a window when I try to open "Help" sub-menu ( or any other firefox sub-menu), or uBlock Origin and Video Download Helper menus. Additionally after I try to open any of the sub-menus even the main Firefox menu draws only an outline. Firefox behaves like this until program restart. After it's opened once again the main menu is accessible (but not uBlock and VDH menus). The other way is to open a private window and access the main menu there ( but only the main menu as in "regular" window). I tried to uninstall the add-ons and clear all the config files but no luck there. Besides, Firefox menu behaving strangely on its own indicates that it may not be any add-on's fault. I attach the screenshot. It was not easy to capture what I'm talking about because the outline usually disappears after pressing "Print Screen". Please help.
Moambuepyre
Opaite Mbohovái (3)
Try the Firefox version from the official Mozilla server if you currently use a version from the repositories of your Linux distribution.
Start Firefox in Safe Mode {web link}
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
@cor-el unfortunately it did not do anything good for me. @ FredMcD That's where it gets tricky: I cannot start FF in safe mode from the main menu for obvious reasons. I got it to start in safe mode via Terminal but it's still the same.