Getting the Firefox button back in Ubuntu 11.04 with Unity

Since I've been trying to learn more about Ruby on Rails (everybody else seems to be doing it, so why shouldn't I?) lately, I've been spending quite some time in Ubuntu instead of my usual Windows 7 environment. And since that's the way I do things, I immediately upgraded to 11.04 when it was released. With Ubuntu 11.04 you get Unity instead of Gnome, which is pretty cool. I generally like it, especially the fact that you can, just like I do in Win7, just press the Windows key and type a few let...