Being a cat person and a Firefox user, I was an instant fan of the Firecat icon for Firefox. The best part about Firecat is not the icon though, it's the fact that the teeny-tiny brand is so overmarketed. The only logical thing you'd want is the application icon but they have icons for both OS X and Windows, sixteen web buttons, six different wallpaper sizes and a little button to click on to vote for shirts being made. OMFG. It's an icon.