add: const xulNS = "http: if ( document.popupNode.namespaceURI == xulNS ) { this.shouldDisplay = false; return; } 
context:     initMenu : function ( popup ) {        // Save menu.        this.menu = popup;        // Get contextual info.        this.setTarget( document.popupNode );                this.isTextSelected = this.isTextSelection();        this.initPopupURL();        // Initialize (disable/remove) menu items.        this.initItems();    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/a13da9e6d669b5976f0213530cdd2cc375d99238/nsContextMenu.js/buggy/xpfe/communicator/resources/content/nsContextMenu.js