// 左鍵開啟Greasemonkey下拉選單
document.getElementById('greasemonkey-tbb').setAttribute('type','menu');

// 右鍵開啟userAgentOverrider下拉選單
if (location == "chrome://browser/content/browser.xul") {
    (function (doc) {
        var userAgentOverrider = doc.getElementById('useragentoverrider-button');
        if (!userAgentOverrider)
            return;
        var menupopup = userAgentOverrider.firstChild;
        userAgentOverrider.addEventListener("click", function (e) {
            if (e.button == 2) {
                e.preventDefault();
                menupopup.openPopup(this, "after_pointer", 0, 0, false, false);
            }
        }, false);
    })(document);
}