[FreeFull]

Seems the only addon I use that isn't compatible is "Disable Ctrl-Q Shortcut". It's an addon I really don't want to get rid of, there have been many cases in the past where I've accidentally pressed ctrl+q instead of ctrl+w, and had Firefox quit on me..

Edit: The page for the addon has a comment saying it does work with multiprocess, so I just forced it on. I'm on Linux, and I don't know of an about:config key to disable ctrl+q

[hvk]

Same. Just found:

https://addons.mozilla.org/en-US/firefox/addon/ctrl-shift-q-...

https://addons.mozilla.org/en-US/firefox/addon/disable-ctrl-... (not yet reviewed)

[tyre]

If you're on OS X, you can override per-Application shortcuts to achieve the same effect. Not sure about other OSes

[phjesusthatguy3]

Does anyone know of such an extension for Chrome and Alt-F4? Chrome seems to handle that all by itself on Debian, which is silly because my window manager doesn't use that for "Close Window".

[stuaxo]

It's worth letting the addon author know if you haven't already.

[djsumdog]

I think you can set that in `about:config` without a plugin

[0942v8653]

If you set browser.showQuitWarning to true (also make sure browser.warnOnQuit is true; that should be default) it will show a dialog to confirm if you want to quit. But if you check the box "do not show next time" it will set browser.showQuitWarning to false.