Google is now rolling out a system where Chrome directly tracks your activity and shares its summary with advertisers.
Also Firefox is faster as of like two months ago.
It takes five minutes to switch browsers, and the difference is so little that you’ll often forget you did it.
I try new browsers all the time and it’s like 5 minutes to switch back and forth between all of the chromium skins and Firefox, and that includes my addon settings, if you don’t have addons it’s literally one button that pops up when you first launch it. People don’t switch because what they have “works” and they don’t really care.