Firefox about:config Hacks and assorted tips

“Firefox is cool, secure, highly customizable,have 1000s of add-ons…blah…blah…blah…all the usual stuffs. But Firefox can be painfully slow sometimes, can waste your bandwidth (by the prefetch technique) and can hog your memory. But thankfully Firefox is highly customizable. You can change every single detail very easily. All you need to know is how to read English!”