Um, OS X already has a nice, built-in, free way to change keyboard shortcuts across any application (with a GUI).
Go to System Preferences > Keyboard > Shortcuts > App Shortcuts. Then click the '+' button. Now change 'All Applications' to 'Firefox.app'. The rest should be self-explanatory.
(Frankly, this capability is one of my absolute favourites of OS X… really surprised you didn’t already know about it).
EDIT: Unbelievable. Firefox actually broke this functionality years ago and it still isn’t fixed¹! Now I remember why I stopped using Firefox. :/
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[ 6.2 ms ] story [ 14.6 ms ] threadGo to System Preferences > Keyboard > Shortcuts > App Shortcuts. Then click the '+' button. Now change 'All Applications' to 'Firefox.app'. The rest should be self-explanatory.
(Frankly, this capability is one of my absolute favourites of OS X… really surprised you didn’t already know about it).
EDIT: Unbelievable. Firefox actually broke this functionality years ago and it still isn’t fixed¹! Now I remember why I stopped using Firefox. :/
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¹ — https://bugzilla.mozilla.org/show_bug.cgi?id=429824