User-Agent: Mozilla/5.0 (X11; Linux i686; rv:2.0) Gecko/20100101 Firefox/4.0 Build Identifier: Mozilla/5.0 (X11; Linux i686; rv:2.0) Gecko/20100101 Firefox/4.0 with Tabs on top and the menubar hidden, the Tab-bar should merge over the titlebar (covering it up) when a window is maximized. This behavior occurs in MS-Windows-installations of Firefox but not Linux-installations Reproducible: Always Steps to Reproduce: 1. right-click a toolbar 2. deselect all option except "Navigation Toolbar" and "Tabs on Top" 3. maximize the window and observe how the titlebar continues to be displayed and the Tab-bar does not merge on top of it Actual Results: the titlebar is not covered up by the Tab-bar Expected Results: the Tab-bar should merge on top of the titlebar to create more vertical space

I believe that this will not be able to occur until GTK 3

gnome-shell is supposed to use GTK 3. Will Firefox put the tabs over the titlebar in Gnome-shell?