

Yes, but IDK of any other way to change the buttons ISOmorph was asking about. The only other way is to find and change/remove them in FF source code and recompile which needs a supercomputer to do, otherwise it may take days to recompile. I assume he doesn’t want to waste days on recompiling, so that’s one way to change things. With GTK3-NOCSD (mostly + some other customizations) my title bar always looks the same way, no matter what changes Mozilla make to it:
Plasma has a not so bad GTK integration which allows GTK apps to use plasma defaults. Also, GTK apps that weren’t written by Gnome also have some good integration with other desktops. Only those written by Gnome are hardcoded to use only GTK styles.