Rated 4 out of 5 stars

Expression Search is indispensable for my daily work and - as apparently for many other users - one of the main reasons why I remain loyal to Thunderbird.

It is all the more annoying that Expression Search does not start almost every time I start Thunderbird. Only when I deactivate the add-on via the extension management, activate it again and then close Thunderbird and restart it, the Expression Search window appears correctly.

As long as this (apparently long known) phenomenon does not disappear, my willingness to financially support further development is low.

This review is for a previous version of the add-on (3.8.11).  This user has a previous review of this add-on.