How to change Mozilla Firefox quit shortcut?

Firefox offers no built-in editor for key bindings.

I have successfully used the Customizable Shortcuts extension which allows you to disable Ctrl+Q

Keybinder is based on the (discontinued) Customizable Shortcuts add-on by Tim Taubert.

To disable the shortcut without installing extensions:

1. Type about:config in the address bar
2. Type browser.showQuitWarning in the search field
3. Change the value to true

Firefox does not allow changing shortcut keys out of the box (not even in About:config).

As far as I know, you have two options:

• For only disabling ctrl+q, you can use the very simple Disable ctrl-q extension.

• For customizing other shortcuts, including ctrl+q, you can install Menu Wizard. To use it, access Tools->Menu Wizard and click the keyboard icon on the top right (in LTR layout) to display the list of shortcuts and select a new one.

Note: the Customizable Shortcuts extension mentioned in the previous answer was discontinued and removed by its author (although the source code can still be found on github). Edit 2016-08-02: the add-on keybinder seems to be a successor to Customizable Shortcuts, although I haven't tried it personally.