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Full user review
Completely customizable. You can make it look like anything, you can get a ton of different add-ons exclusive to only firefox.
Adobe flash messes stuff up. Firefox requires a separate adobe flash plugin. This keeps it from crashing as often as chrome does, but if there is a bug in flash the bug will crash the entire browser. Firefox should have flash prebundled like chrome does, so the plugin itself shows that it is messing up and not the browser. The latest version of flash is essential to getting firefox working properly, and if a bug comes out in adobe you are pretty much out of luck unless you revert to a different version of flash.