Rated 5 out of 5 stars

extends Thunderbird, Seamonkey and Pale Moon build-in password manager with timout, automatic lock and other useful features.
Before you start complaining this extension is not compatible with Firefox 57+, learn WHY Mozilla ruined own product by removing XUL add-ons and replacing it with crippled-down API.

This review is for a previous version of the add-on (1.29.2).