Firefox & Chrome:
For both current versions (at time of post) of Firefox and Chrome in OSX, CMD+SHIFT+F invokes a full
screen view; FF with the smother transition.
Still no Safari hotkey from what I could find. It would be useful. An easy to convey full screen hotkey for the OS default browser would be nice, and perhaps more importantly, a consistent full screen experience across browsers (wishful thinking).
I don't know when either browser implemented it, but I've been using it for a while now, even if only to filter out the little bit of application window chrome and top menu bar visual noise that OSX normally shows while I'm browsing sites. For me, another example of a less-is-more preference.