Aurora(FF29) will soon be released,users who are using FF29 will absorb to update to version 1.4.5 for compatibility.
Major Changes in 1.4.5
TMT Arrow: Because of the layout change of tab in FF29, the active (or selected) tab can only be sent to the current row by double-clicking on anywhere of the tab (not just the arrow), and the tab must be selected and the TMT arrow is shown.
The TMT arrow now also works for OS X,you can also send tabs using the new mechanism
Options Page: The new "Rearrange via bookmarks" will open the "Library" directly, and you can easily rearrange their rows inside the TMT folder, and i.e. Unsorted Bookmarks > TooManyTabs (achieve Not Delete)Enjoy!
Source: visibotech.com