Maybe that's because OS X makes the scroll wheel consider acceleration (move the scroll wheel quickly, you scroll more, move it slowly, you scroll less), unlike Windows/Linux?
Same here. But I'll keep using Firefox because I cant stand what Chrome is doing with my cpu/memory/privacy and I want to keep Safari (the less 'usable' browser) for work related stuff and Firefox for personal ones, on another desktop space.
Two firefox profiles? One for work and one for personal?
Type "man firefox" into your terminal and you will see the relevant options and can set up aliases and shortcuts appropriate for your separated browsing needs.