Mouse's buttons 4 and 5 operate as back and forward shortcuts in Firefox. Accidentally pressing these buttons has been common with every mouse I've owned and has resulted in severe issues with banking websites and job applications. I don't want to disable the hardware keys because these extra buttons are useful especially in games with complex control schemes.
Firefox – How to disable mouse back and forward shortcuts
firefoxmouse
Best Answer
about:config
into Firefox's address barmousebutton
. You should find two preferences,mousebutton.4th.enabled
andmousebutton.5th.enabled
, both set to true. Double click each of these to set them to false.