Backout 6cfbba02f9b5
eeee61538fce
Backout 4107aaf07ce1
Backout	123e83dea14c
Bug 1088789 - Switch invalid CSS variable name from negative-space to space-above-tabbar;r=jaws
Bug 1053434 - Shared theme changes for window and navbar for devedition;r=Gijs
Bug 1053434 - CSS changes for DevEdition on Windows. r=mdeboer
Bug 1053434 - Part 4 - Linux theme changes for devedition.css