Added optional check GNOME Shell (#15)
Some changes in check GNOME Shell
Added search 'pidof' command in PATH
Reworked debug mode
Change debug mode
Add _find_path_to_exec and _run methods
Add use _GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED property
Add inline settings
Add legacy mode selection
Redesign legacy mode
Change in make-xpi.sh
Small clear up
Add new settings: "Show close button"
Fix minor bug in legacy mode
Fix padding of the tabs toolbar
Add usage nsIPrefService
Add observer over settings
Move init() to top