I'd get Chrome, but mum wouldn't let me, and she has a reason this time. GOOGLE KNOWS YOUR CREDIT CARD NUMBERS. I don't need it knowing passwords and search history too > >
Alright. Safari and Opera. I don't know about Maxthon. If your mum has anything against Apple, then Opera. I'll probably have to dig out some more browsers. Crap, there aren't any more left to dig out.
Opera has apparently been around since 1996. It's an excellent browser and has won quite a number of reviews. And by the way, the browser on the Nintendo DS and Wii, is Opera.
Whether you want to take a risk, is up to you. You should probably get another opinion here. I don't know if I would, if I were in your position. Since I don't whether your IE broke because of FF or something else which is not obvious.
Aside from its speed, Chrome's lightweight interface is its most popular feature I presume. But I, don't find a problem with Firefox's GUI. I've used older more antiquated browsers so I don't find FF's GUI to be a problem at all.