keysnailで文字入力→検索エンジン選択みたいな

querythenengine.js

plugins.options["search-url-list"] = [
["bing","http://bing.com/search?q=%q"],
["raw","%r"],
];

ext.add("query-then-engine", function () {
    prompt.read("Search Word?:", function (q) {
        if (q) {
            prompt.selector({ message : "search \"" + q + "\" with?",
                              collection : plugins.options["search-url-list"],
                              width : [20,80],
                              callback : function (i) { if (window.loadURI) {getBrowser().selectedTab = getBrowser().addTab(plugins.options["search-url-list"][i][1].replace("%r",q).replace("%q",encodeURIComponent(q)));} },
            });
        };
    });
}, "enter search word and then select engine");