Firefox 4 Robot

If you install Firefox 4 Beta 1 candidate build, which is now available for testers, you'll see this guy.

Firefox 4 Robot

It's probably the Firefox 4 giant robot.

Mozilla uses robots whenever it releases a Firefox version bearing a new number series. Just like this one for Firefox 3.

Firefox 3 Robot

Can't wait for the final Firefox 4 robot art if the one in the first photo isn't.