Why Epiphany?
hub: I second you that the tabs bug in Epiphany is quite annoying, but I like Epiphany more, because here in 2005, browsers still crash, once a week maybe, but they do. And I hate losing all my open tabs. That's why Epiphany has a crash recovery that "Just Works." I'm sure there are extensions for Firefox that do that, but following the GNOME philosophy, I'm really busier with my stuff than going finding extensions for my web browsers to make it just work. The crash recovery is pretty handy even if browsers do not crash. When I'm running out of office, I lock my screen, and I know that if I come back tomorrow I see my session killed, but that really doesn't matter anymore, Epiphany keeps track of where I was.
There's another reason that I like Epiphany, it has better Persian support, thanks to Pango and Gtk+. Namely, it handles right-to-left tooltips pretty nice.