Oh man, the middle click autoscrolling is one of my favorite features. To scroll all over a huge page, you just middle-click once and nudge your hand a couple p

Oh man, the middle click autoscrolling is one of my favorite features. To scroll all over a huge page, you just middle-click once and nudge your hand a couple pixels up and down. Boom, free scrolling with just tiny nudges of your hand. It's probably how I do 90% of my scrolling in Firefox. (No opinion on the default setting; it's easily findable in the Settings dialog.)