CmdUtils.CreateCommand(
  {name: "go",
   takes: {"search terms": /.*/},
   preview: function(pblock, dobj) {
     if (dobj.text.length == 0) {
       pblock.innerHTML = "<b>Please enter a search term</b>";
       return;
     }

     var history = Cc["@mozilla.org/autocomplete/search;1?name=history"]
                   .createInstance(Ci.nsIAutoCompleteSearch);

     var observer = {
       onSearchResult: function onSearchResult(search, result) {
         if (result.searchResult == result.RESULT_SUCCESS ||
             result.searchResult == result.RESULT_SUCCESS_ONGOING) {
           var html = "";
           for (var i = 0; i < result.matchCount; i++) {
             var image = result.getImageAt(i);
             var title = result.getCommentAt(i);
             var url = result.getValueAt(i);

             if (!title)
               title = url;

             if (image.indexOf("moz-anno:favicon:") == 0)
               image = image.slice("moz-anno:favicon:".length);
             else
               image = "";

             html += '<div class="gresult">';
             if (image)
               html += ('<img src="' +
                        Utils.escapeHtml(image) +
                        '"/> ');
             html += ('<a href="' + Utils.escapeHtml(url) + '">' +
                      Utils.escapeHtml(title) +
                      "</a>");
             html += ('<div class="gresult-url">' + Utils.escapeHtml(url) +
                      '</div');
             html += "</div>";
           }
           pblock.innerHTML = html;
         }
       }
     };

     history.startSearch(
       dobj.text,
       "",
       null,
       observer
     );

     pblock.addEventListener(
       "preview-change",
       function onPreviewChange() {
         pblock.removeEventListener("preview-change", onPreviewChange, false);
         history.stopSearch();
       },
       false);
   },
   execute: function(dobj) {
     if (dobj.text)
       Utils.openUrlInBrowser(dobj.text);
     else
       displayMessage("No URL was provided.");
   }}
);

function cmd_show_tabs() {
  var content = context.chromeWindow.document.getElementById("appcontent");
  var browser = content.firstChild;
  var tabs = browser.tabContainer;
  tabs.style.height = "25px";
  tabs.style.marginTop = "0px";
}

function cmd_hide_tabs() {
  var content = context.chromeWindow.document.getElementById("appcontent");
  var browser = content.firstChild;
  var tabs = browser.tabContainer;
  tabs.style.height = "0px";
  tabs.style.marginTop = "-500px";
}