Full-screen mode in Firefox on Mac OS X?

if you go into the info.plist file for your FireFox application and add in an item for Application UI Presentation Mode you can automatically hide the dock and the menu bar whenever the application is active:

That way as soon as you launch it the menu and dock will disappear and you can just hit the zoom button to fill the entire screen. Tabbing over to the other applications will bring back the dock and menubar as will mousing up to the top and bottom edges when firefox is in focus.

To be honest, it's not possible to maximize a firefox window completely on a mac. However, it is possible to maximize the window to fit in the whole screen. To do this just follow these steps:

1. Create a new bookmark by right clicking on the bookmark toolbar. If you don't see the bookmark toolbar just go to View > Toolbars > check Bookmark toolbar.

2. Give the bookmark a name like Fullscreen (something that you can remember) and then paste the code below in the Location box. Make sure you paste all the code in 1 line only though, or else it won't work.

   javascript:self.moveTo(0,0); 
   
   self.resizeTo(screen.availWidth,screen.availHeight);
   

   

3.Click OK, and then just click on the Fullscreen button to maximize Firefox.

Then once you click on the Fullscreen Button, Firefox should then take up all the space that OS X allows an application to take up, depending on the size and position of your dock. Sometimes, when I'm viewing pictures, I like to minimize the dock by pressing Cmd + Option + D and this will allow Firefox to take up more space.

Source: http://beyondteck.blogspot.com/2007/12/fullscreen-in-firefox-on-mac-os-x.html

Real full screen mode in Firefox on Mac OS X is now in the nightly builds (Minefield). It works great. If I understand it correctly, the feature will be included in the upcoming 3.6 release.

Maybe this help. http://jeff.globl.org/projects/firefox/fullerscreen-1.0x.xpi works for me in OSX 10.5.7 and Firefox 3.5.5

Firefox 3.6 allows this: Shift-Apple-F