Mozilla Firefox, what can I say about it that hasn’t been said before? Some may claim that Firefox has grown into a hard to tame beast. Others will list all the advantages of running Firefox: extensions, flexibility, constant new developments, huge fan/user base, and great support. In short: Internet Explorer’s biggest rival since Netscape.
While Mozilla’s “open to user manipulation” nature generally is a benefit, it can also cause a lot of issues. As a result, Mozilla’s flagship browser may be buggy, i.e. slow launch, slow page loading, unstable, crash often. However, most of these bugs are man made and chances are you can easily fix them yourself.