I used to take advantage, before FF Quantum, of the great "Warn before quit" plugin, that was much more comfortable: you were simply prompted to press CMD-Q again if you were sure of quitting. Here it's to basic to just disable CMD-Q! At least, there should be the option to quit otherwise, for instance by Alt-Q or whatever else.
Worked great until Mozilla changed the panic-quit command from Ctrl+Q to Ctrl+Shift+Q, which I've accidentally mashed, so this extension no longer does anything. (Experienced in Firefox 62.0.2, Windows 7, 64-bit.)
It doesn't work at all. I'm running Firefox 62 on Debian Stretch with Gnome.
Edit: I'd like to apologize as I just now realized that the description says the extension doesn't work for Linux. Apparently there doesn't seem to be a way to delete my review, so I'm changing my rating from 1 star to 3 which I consider neutral.