addEventListener("dblclick", function(e) {
   var target = e.originalTarget;

   if ( e.button !== 0 || !target._placesNode || !PlacesUtils.nodeIsFolder( target._placesNode ) ) return;
   var hostName = '[hst]' + window.gBrowser.selectedBrowser.contentWindow.location.hostname + '[hst]';
   var docTitle = ( content.document.title || gBrowser.mCurrentTab.label).substr(0, 50);
   var folderId = PlacesUtils.getConcreteItemId( target._placesNode );
   var folderTitle = PlacesUtils.bookmarks.getItemTitle( folderId );
   var parentFolderTitle = PlacesUtils.bookmarks.getItemTitle( folderId );
   var currentURI = Services.io.newURI( content.location, null, null );
   var getSel = document.commandDispatcher.focusedWindow.content.document.getSelection().toString();
   var selTxt = '';
   if (getSel) selTxt = '[txt] :: ' + getSel + ' :: [txt]';
   PlacesUtils.bookmarks.insertBookmark( folderId, currentURI, 0, hostName + docTitle + selTxt + '[' + folderTitle + ']');

   // всплывающая подсказка ....
   var favicon = ( !!gBrowser.mCurrentTab.image ) ? gBrowser.mCurrentTab.image : "chrome://global/skin/icons/Portrait.png";
   Cc["@mozilla.org/alerts-service;1"].getService(Ci.nsIAlertsService)
      .showAlertNotification( favicon, "Добавил в папку " + folderTitle + ":", docTitle, false, "", null, "");
});

addEventListener('popupshowing', e=> {
   var popup = e.originalTarget;
   if (!(popup.localName == 'menupopup' && popup.hasAttribute('placespopup'))) return;
   Array.slice(popup.querySelectorAll('menuitem.bookmark-item')).forEach(mItem=> {
      var label = mItem.label;
      if (!label.startsWith('[hst]')) return;
      var host = label.split(/\[hst\](.*)\[hst\]/)[1];
      mItem.setAttribute('acceltext', host);
      if (label.indexOf('[txt]') !== -1) {
         label = encodeURIComponent(label);
         mItem.label = decodeURIComponent(label.replace(/%5Bhst%5D.*%5Bhst%5D|%5Btxt%5D/g, ''));
      }
      else
         mItem.label = label.split(/\[hst\].*\[hst\]/)[1];
   })
}, false, window);

addEventListener('popupshowing', e=> {
   var bhTltp = e.originalTarget;
   var tipTitle = document.getElementById('bhtTitleText');
   var tipTxt = tipTitle.textContent;

   if (tipTxt.startsWith('[hst]')) {
      var hLabel = document.createElement('label');
      hLabel.id = 'bhtHst';
      hLabel.textContent = tipTxt.split(/\[hst\](.*)\[hst\]/)[1];
      bhTltp.appendChild(hLabel);

      if (tipTxt.indexOf('[txt]') !== -1) {
         tipTxt = encodeURIComponent(tipTxt);
         var tLabel = document.createElement('label');
         tLabel.id = 'bhtTxt';
         tLabel.textContent = decodeURIComponent(tipTxt.split(/%5Btxt%5D(.*)%5Btxt%5D/)[1]);
         bhTltp.appendChild(tLabel);
         tipTitle.textContent = decodeURIComponent(tipTxt.replace(/%5Bhst%5D.*%5Bhst%5D|%5Btxt%5D.*%5Btxt%5D/g, ''));
      }
      else
         tipTitle.textContent = tipTxt.split(/\[hst\].*\[hst\]/)[1];

      bhTltp.addEventListener('popuphiding', function func() {
         if (hLabel) bhTltp.removeChild(hLabel);
         if (tLabel) bhTltp.removeChild(tLabel);
         bhTltp.removeEventListener('popuphiding', func);
      })
   }
}, false, document.getElementById('bhTooltip'));

// Двойным левым кликом на папке закладок добавлять закладку в папку закладок, от 15.08.2016. ......................
addEventListener("dblclick", (e, targ = e.originalTarget)=> {     
   if ( e.button || !targ._placesNode || !PlacesUtils.nodeIsFolder(targ._placesNode) ) return;          
   
   var docTitle = (content.document.title || gBrowser.mCurrentTab.label).substr(0, 50);
   var folderId = PlacesUtils.getConcreteItemId(targ._placesNode);
   var folderTitle = PlacesUtils.bookmarks.getItemTitle(folderId);
   var currentURI = Services.io.newURI(content.location, null, null);
   PlacesUtils.bookmarks.insertBookmark(folderId, currentURI, 0, docTitle);  

   // всплывающая подсказка ....
   var favicon = gBrowser.mCurrentTab.image || "chrome://global/skin/icons/Portrait.png";
   Cc["@mozilla.org/alerts-service;1"].getService(Ci.nsIAlertsService)
   .showAlertNotification(favicon, "Добавил в папку " + folderTitle + ":", docTitle);

   document.getElementById("contentAreaContextMenu").hidePopup(); 
   gBrowser.removeCurrentTab();
});