The reason I use Firefox is because it has a set of extensions I find useful, and because I like Firefox Sync (end-to-end encryption of bookmarks/history etc.).

The reason I use Firefox is because it has a set of extensions I find useful, and because I like Firefox Sync (end-to-end encryption of bookmarks/history etc.). Whether the browsers shave a few microseconds off JavaScript performance is neither here nor there for me: but perhaps I'm a weirdo. Performance is nice, but not enough of a reason for me to switch browser.