Some keybindings are ingrained. I use Quail and Electric quotes all the time in Emacs (modes which modify the letters you input), and I write lots of prose in Emacs, so using Ctrl-q <char> to "quote" a character to input it literally is something I frequently do. It happens that sometimes I do that out of muscle memory in Firefox, and Ctrl-q quits in Firefox. Or you press Ctrl-n for next line a couple times but you get some new blank windows instead. I confuse Ctrl-f and Ctrl-s all the time. Many other bindings are easily confusable.

I'd actually like Firefox to be customisable instead of a hack like this. I'll probably just switch to the Next browser [1] in the future though.

[1] https://github.com/nEXT-Browser/nEXT