My (Government) workplace still uses IE 6. Trying to browse(let alone leave a comment on) anyone's blog -in my lunch break of course-is hysterical. And of course I'm banned from trying to modify my computer in any way, and all sites categorized as 'gaming' or 'social networking' are flat-out blacklisted.
Anyway, at home I like Firefox, just because I like it. When I'm Simming at the same time, Chrome seems to slow my game down. Having Firefox open doesn't seem to hog half the resources that Chrome does.