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You have been able to turn off the nav bar in FF and I think IE for ages.

In Opera: Menu -> Toolbars -> Uncheck Address Bar.

Where is the Opera article?

Also, Safari. My favorite way of browsing docs is to open them up and hide the tabbar, urlbar and statusbar at the bottom of the screen. this leaves me with a very minimalist window and let's me focus completely on what I'm reading.

F11 (aka fullscreen)?

I'm running Mac; F11 does the opposite and shows my desktop.

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