Rated 5 out of 5 stars

Nice one. There is just a small bug. I use TB portable with enigmail and gnupg 1.4 portable. I tried to update to gnupg 2. As this was not successfull I downgraded to 1.4 again. And then this bug occured:
I wasn´t able to save configuration of enigmail anymore with actived TB conversations (next mentioned as TBC). With deactivated TBC I can saved it, encrypted mails were decrypted. After activating TBX again this was true also until a restart. After a restart enigmail asks again for an installation of gnupg and configuration can not be saved.
I solved that problem with uninstallation of TBC, configuration of enigmail and then a new installation of TBC.
Hope this helps either developers and/or users.

This review is for a previous version of the add-on (2.8.1).