Rated 5 out of 5 stars

Amazingly helpful for finding old emails and sorting conversations, and the developer is still on top of maintenance. Looking forward for the upgrade so that it works with TB 24.

This review is for a previous version of the add-on (2.1.702). 

I just submitted version 2.2.0, which works in Thunderbird 24. Either wait until it has been reviewed and appears here or download it at http://threadvis.github.io