Do you use Safari on your Mac?
Do you use Safari on your Mac or do you use Chrome/Firefox? If you do, why?
I personally use Safari since it is the lightest and fastest in my opinion. Firefox is too clunky and slow and has too many updates, and is a huge memory hog. Chrome, while quite fast, wasn't as fast as Safari 7 in my testing and also uses more power and memory than Safari. Even though Safari doesn't have many extensions, it has all the ones I need (Adblock, Photo Zoom, etc.)
Also I like Safari because it supports multitouch gestures really well and syncs with my iOS devices really well. What do you use and why?