never heard of Avant . I use FF and its best for me . Don't think anyone can come closer to FireFox .. It Rocks
firefox is more user friendly and faster then any browser.basically most of website prefer to use firefox.
After the new update it's much better, on the older Opera I had real problems viewing URLs with complex coding, seemed to be a CSS etc. issue or something like that.
Never heard about this Avant Browser. I'm using Firefox, I love plugins of the Firefox its very seo friendly.
Firefox is the best in my opinion and it just get better with every update and new version. The only think that I don't like about firefox is the annoying security issues that it have with the self signed SSL certificates.