*** Important: Users of Tree Style Tabs would have problems when using TMT 1.3.6,please update to latest version 1.3.7 ****
*** If you are using FF35 (steady channel) or FF36 (Beta Channel), please depart to TMT options and uncheck "imprint TMT folder readonly". ****
Firefox 36 will arrive soon and this update includes several bug fixes which are necessary for TooManyTabs to work properly in FF36.
Two options are removedSend tab by single/double click - Users have to double click the TMT arrow to send current tab TMT. If it is not responsive sometimes, or please try clicking on the arrow directly or exercise the proper click context menu insteadMark TMT folder as ready only - the TMT folder in Unsorted Folder will no longer be readonly,users can edit it via the Bookmarks manager anytime.
The pin tab icon is shown againMultiple rows should now display properly even when positioned on the top of the browserEnjoy!
Source: visibotech.com