Rated 4 out of 5 stars

I installed the software and so far i had no problems. Encryption and decryption works perfectly and brings more security.
It's nowhere mentioned, that a permanent decryption of E-Mails after receiving them in an inbox or in a folder is not possible (except you export them as Text-File).
As a result, the inbuilt helpful Thunderbird search and filter functions to organize and search messages cannot be used for encrypted messages anymore.

This review is for a previous version of the add-on (0.96.0).