Make Backspace Key Work Correctly in Firefox on Linux

 

Type about:config into the address bar :

then 

filter by the following key:

 browser.backspace_action

Double-click on the item in the list and change the value to 0.



The change should be immediate – you can hit the backspace key to go right back to whatever you were doing (probably reading this)
This tip should work on any platform… I’m not sure if all versions of Linux have the same annoyance, but at least Ubuntu does.