Rated 5 out of 5 stars

This add-on is still working great in Fx 18.

To change the <em:maxVersion> follow the instructions on this website:
http://www.techsupportalert.com/content/how-update-firefox-thunderbird-addons-n

You may have to restart Fx a couple of times fot the new title to show up.

This user has a previous review of this add-on.