There was this (mis)conception a while ago about FF's speed compared to Chrome. Also, its UI looked a bit outdated (not that you couldn't skin it) compared to Chrome, Opera, etc. But with the recent changes in the past 2-3 years, FF has proven once again to be superior in almost all aspects. It even looks and feels more modern than Chrome. Couple that with the way the redesigned the mobile app (esp. on Android) and you get users like me who ditch Chrome on all platforms and start using FF again.