Full Screen for any Cocoa App!

I was in the market for something that would take Safari and make it full screen. I looked for plug-ins, options to do the same in Firefox, and so on. However, it was difficult to find at first. It turns out that Mac has a built in function that works for all Cocoa apps and is not limited to Safari. It's simple, just hold command and press enter and the frontmost cocoa app will fill the entire screen, knocking out the dock and the menubar, perfect for browsing the internet without being bothered by other things.

Enjoy.

[EDIT]

A note about using this feature, I've noticed that sometimes it just doesn't seem to work. I think this has to do with mouse focus. Even if the mouse is focused on an application, sometimes that application may change that focus so that the command doesn't work. I'm not sure why exactly, but in Safari, I can open a new blank tab and the command works fine, so it is dependent on what's on the page. I have not had any problems with Mail or Finder, but those are simpler programs. 

Apple Feedback