Howto Fix Backspace annoyance and Mozilla Firefox for Linux

Ran into this little annoyance while flipping around in my Mozilla Firefox in Linux. Being used to Windows I keep hitting backspace to return the the previous webpage.. but in Mozilla Firefox for Linux it is not possible, by design I think, at least not by default.

This is a little information on how it is possible to speedup Mozilla Firefox somewhat

There are no guarantees to this so please make sure you know what you're doing

This is more or less a rip from LinuxMint WiKi turorial on how to make Firefox faster on Linux Mint

Before making any changes, please make sure you have a good backup of your prefs.js file from your Mozilla Firefox profile.