removed code that does not seem a good idea to keep since (1) it modifies a preference outside the control of easyGestures, (2) that preference applies to non-chrome code (see http://kb.mozillazine.org/About:config_entries#DOM.) and (3) the code is buggy anyway and it is not clear what it _exactly_ does (properties eGc.menuState and eGm.stateMenu, and function resetInitialContextBrowserOption do not exist)
refactored code to encapsulate (partially at this moment) implementation details