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Firefox does. Safari still doesn't.

Oh, sorry about that, my Firefox is slightly out of date (3.5.9) and doesn't seem to have full-screen mode.

Doesn't 3.5.9 have a security hole?

I think 3.5.8 had an exploitable use-after-free bug, but 3.5.9 fixed it.

Use Megazoomer to make any app full screen:

Yes, in Chrome, just hit Command-Shift-F for full-screen. It's awesome!

Btw, this PlainView app appears to be 2 years old. How is this getting upvoted?

There are also plugins for Safari that add it such as Saft.