Very useful addon. The integration with Containers is especially useful. You can also backup and restore your settings.

This is a very easy to use, privacy enhancing feature. Once you've setup the whitelist, you don't even notice it doing its thing in the background anymore.
Notifications available for nerds like me who like to know that stuff. A great addon, thank you.

Finally I can open Gmail tab and be sure not to stumble into any mailbox left open by my wife or son previously.

Delayed autodelete is also precious, just set it to a quite long time (i.e. 5 or 10 minutes) and you can still reopen that mailbox tab you have mistakenly closed, without having to retype your credentials.

Thanks so much for this addon!

PS. A BlackList feature would also be appreciated. I often need to delete cookies only for particular sites (i.e. webmail sites, social networks, etc.).

works
works with the Firefox Container
simple GUI
can recommend it to everyone

Marvelous!

Super add on. Amazing how many cookies are created and can be deleted without breaking websites.