I always end up coming back to Safari for personal use. It seems to do the best job getting out of my way. I am annoyed by how Safari now handles browser extensions. I’d like them to take a page out of Orion’s book and support both Firefox and Chrome extensions. However, I generally have very few extensions, as they tend to slow things down, so this has been a relatively minor issue. The main things I’ve wanted extensions for in other browsers (like word lookup) have come out of the box in Safari (or Apple platforms as a whole) for quite a long time.
Using the 3 regularly, no, Firefox is not "10 times better than Safari". Though, yes, Chrome(ium) is a ressource hog.
EDIT: whoops, should've scrolled down a bit on the website, looks like Waterfox has vertical tabs as well. damn, probably going to try to migrate to it sometime soon...
EDIT2: of course supports firefox extensions as well, perfect.
If people read the release notes instead of the comment sections, not only would they have a lot more specific knowledge of the work going into the browser but they wouldn't be locked in this cycle of outrage and escalation that normally you only see in YouTube comment sections.