Again, one more post how to hide the “I’m so big and useless” titlebar in Firefox on GNOME 3.
Draw Firefox’s Tabs In Titlebar On GNOME
Firefox’s titlebar is hidden by default on OS X and Windows(?), and in any case it is a Firefox option, which isn’t working on GNOME and other Firefox-GTK desktops.
Tabs-on Titlebar | FALSE[caption id="attachment_25770" align="aligncenter" width="640"] Drawing Tabs on Titlebar[/caption]
Tabs-on Titlebar | TRUE[caption id="attachment_25771" align="aligncenter" width="640"] This is the default look[/caption]
This won’t have any effect under GNOME (tested on FF29-FF32), and you might blame GTK2 for it, but Chromium does it fine, by drawing its custom bars. Personally, if I was a Firefox user I wouldn’t be very happy about it, but luckily I’m mostly using Chrome :)
Give Firefox A GNOME 3 Native Look[caption id="attachment_25780" align="aligncenter" width="640"] Firefox 29[/caption]
The above figure demonstrate what you can do, if you read the instructions at:
The guide contains a set of extensions and customization options, and it will take you around 10-15 minutes to complete it. However you aren’t forced to strictly follow the instructions there. Actually you can do some things differently that might be better.
Notice that there are bugs; for example, double clicking for maximize the window isn’t working, so you have to use shortcuts (Super+Up), or alternatively to drag the window on the top edge of the screen (tiling).