A friend pointed this out to me:
In short, if you’re a GNU/Linux user of Firefox (e.g. Firefox on Ubuntu and Iceweasel on Debian) you may want to get backspace to actually go back one page, like many browsers do (did?):
- In addressbar, type about:config
- If asked, confirm you want to change settings
- In search, type browser.backspace_action
- Set the value of browser.backspace_action to 0 (that is zero, not letter O) Zero is Windows default and makes pressing backspace go back in history; One is old Linux default and scrolls page up; Two is new Linux default and, like any other integer, simply unmaps the backspace key.
Now, enjoy pressing backspace to go back!