I have the Full Screen option in the latest version, on Ubuntu and I don't remember a time when it wasn't there. It's still in the "View" menu. I just press F11, the default shortcut.

Furthermore, Firefox implements the HTML5 Fullscreen API, which gives the ability to websites themselves to request the full-screen mode, with a dialog pop-up that allows you to either deny, or to temporarily or permanently give this privilege to a website: https://developer.mozilla.org/en-US/docs/Web/Guide/DOM/Using...

So basically your full-screen HTML presentation can load in full-screen mode by itself, without the user having to make an explicit View action for it.

I find it hard to believe that you don't have it. If it's true, maybe it's a problem on OS X that will likely get fixed.

The fullscreen API works fine. A website can display itself without any other clutter on the screen (with user permission). Unfortunately, it is no longer possible for a user on Mac OS X to cause the switch to fullscreen. The view menu (Firefox 21.0, for example, on OS X) still offers an "Enter Full Screen" menu item. Unfortunately, all it does is hide some of the chrome (it hides the menu bar and the title bar), leaving other bars (tabs, URL) still cluttering the screen.

It has been this way for a couple of years, if I recall correctly, and it is only a "feature" on OS X. Nothing is being done to change it, AFAIK.

I just tried this on Nightly and the chrome that's left behind (tabs + URL) slide up and out of the way within half a second of entering full screen mode, leaving nothing but the webpage on the screen. Are you sure that this isn't happening for you?

Works great on Linux, but that feature is totally absent on OS X.

I'm using this add-on in the meantime, but it has other issues: https://addons.mozilla.org/en-US/firefox/addon/old-lion-full...

Yes, I'm quite sure. On OS X, I can get real full screen with Chrome, and I can get it with Firefox if the website itself initiates it. But the "full screen" in the View menu removes half of the chrome and leaves the other half. Useless.

It turns out I'm not the only one complaining. It has been a known issue since at least early 2012. Apparently, some of us think full screen should mean FULL screen. Nobody at Mozilla is working on it: https://bugzilla.mozilla.org/show_bug.cgi?id=740148

You might need to enable the "hide toolbar" option, which can be accessed by right clicking the toolbar in the right place while in full screen. I'm unsure if this option is available on OSX.

I appreciate your making the effort to help. Unfortunately, as you suspected, it's not an option on OSX.

Works for me, as the other commenter stated.

In addition I'm running the Tree Style Tabs addon, which moves all tabs to the left. While I look at a full screen Firefox I can move the mouse to the left side of the screen and the list of tabs will show up -> There's no way to get better screen estate usage, imo.

People are always complaining about existing features being lost.

"I am not using firefox again until they reinstate the back button!"

I see this kind of stuff on reddit and slashdot all the time. Is it some sort of FUD campaign against Firefox?

Click view > Enter Fullscreen

You can also use F11, unless you set OSX to high-jack that button. You can also use the fullscreen button in the top right corner on lion versions of OSX.

I still see the bar with the address and search fields, and associated buttons to the left and right. They don't seem to go away. This is on OSX.

The OSX fullscreen button does the same thing, leaving me with chrome up top.