How to detect the current active theme name on Firefox

Sometime obtaining informations about components isn’t so quick, you must iterate over RDF, XML or call many API.

Sometime is very simple like get a pref string… well this time I’m lucky

The pref general.skins.selectedSkin contains the current active theme name.

var currentThemeName = Components.classes['@mozilla.org/preferences-service;1']
.getService()
.QueryInterface(Components.interfaces.nsIPrefBranch)
.getCharPref("general.skins.selectedSkin");