Mozilla is the complete suite, with integrated mail client, and HTML editor, and Firefox is the stand alone browser version, Michelle. There are a few small differences between the two, but the basic engine is the same in both. I would recommend giving Firefox another go, and if you like it, and are also looking for an e-mail client, try Thunderbird, or go to the Mozilla Suite which has it all in one, the advantage of which being that it's only taking up one portion of resources, whereas running both Firefox and Thunderbird separately, obviously takes up two portions.