opera has tabbed browsing as well.. i actually use both and i think opera has a few things firefox doesnt and vice versa for example opera lets u continure from the last page you saw, and lets you reopen a tab if you accidentally close it Firefox has the extensions, which as far as i have seen, opera does not.
i think the biller and all the zones are run based on politics.. on who u know and ... thats it.. lol not saying anything bad, but it seems like its a power struggle here.