I recently got the beta and noticed that the tab scroll speed was changed to something a lot slower. It is now very impractical to scroll through a large number of open tabs. While messing with the about:config settings I figured out that you can change the (mousewheel.default.delta_multiplier_y) value to change this speed. I set mine to 200, but any preferred value can work. Thought I'd share this in case anyone else was having the same issues. löysin vastauksen<3