Rated 2 out of 5 stars

Gmail started blocking my Thunderbird app from accessing my account at my very first attempt at installing and testing TorBirdy. The only way to get it working was to go into my gmail account and "allow access to less secure apps". This leaves my account more vulnerable to attempts to break into my account. However, I can now access my account but I have to sign in every time, which I did not have to do previously. I am not happy with this situation. There seems to be no way to undo it. Removing TorBirdy did not help. Google continues to block automatic sign-in attempts from the my Thunderbird app because it is now deemed to have "known security problems or is out of date." I can live with signing in every time, but I don't like having my account less secured. I was better off just using Thunderbird on a computer with a VPN service activated.

This review is for a previous version of the add-on (0.2.0). 

Removing TorBirdy restores all settings (especially the proxy settings prior to install). While the Gmail problem you have described is common (we describe it on the wiki as well), I am surprised why removing TorBirdy didn't alleviate it. Did you revert the "allow access to less secure apps"?