It doesn't work. I think firefox is an amazing browser. I am using it right now... It's incredible. Open source, free, skins, tabbed browsing (yes, I know there's opera and IE7) but I'm used to firefox and I think it's a great browser. I've used both opera *the free one) and IE7 and I still firefox is the best among them.
Yeah, I would use opera too but I'm just so used to firefox that I find that I can find the features of firefox better. It's all about preference really, personal opinion. Some people like one browser and others think different.