init: {
var contextMenu = document.getElementById('contentAreaContextMenu');
var separator = document.getElementById('context-sep-properties');
var menu = document.createElement('menu');
menu.id = 'viewcache-menu-group';
menu.setAttribute('label', '\u30da\u30fc\u30b8\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u958b\u304f');
contextMenu.insertBefore(menu, separator);
var menuPopup = document.createElement('menupopup');
menu.appendChild(menuPopup);
for (var i = 0, menu; menu = mMenus[i]; i++) {
var menuItem = document.createElement('menuitem');
menuItem.id = 'viewcache-menu-' + i;
menuItem.setAttribute('label', menu.label);
if ('accesskey' in menu)
menuItem.setAttribute('accesskey', menu.accesskey);
menuItem.culMenu = menu;
menuItem.addEventListener('command', function(e) {
var tab = gBrowser.addTab(e.target.culMenu.url());
gBrowser.selectedTab = tab;
}, false);
menuPopup.appendChild(menuItem);
}
}
})();


>>667長いから分割した。すまん