Okay, so this is the whole script i use to replace MenuEdit. I dont know how helpful it is since i used id's for menuitems and menuseparators wherever i could to use as few chars as necessary but maybe some can adapt the method and add their own id's. NOTICE: some changes of menus of the menubar require a restart to take effect. You can find a list of the basic menuitem id's and menuseparator id's in this knowledgebase: http://kb.mozillazine.org/UserChrome.css_Element_Names/IDs#Firefox_menus
Great!
Like it!
works great