This Add on Has been Very good. I've been keeping track of it since installation and I really like the features it has along withe the layout of all the options within the extension.
I've found it very versatile and easy to use. I was using Cookies Autodelete but heard of thsi extension and thought to give it a try (I mean why not) I think this extension is a lot better in designed and the functions it has available. I personally feel I have more control with this addon. Keep up the great work on this addon.
It doesn't require container tabs. It just needs the permission in case you use container tabs so that it can perform the cleanup properly. If you don't use container tabs, Forget Me Not will not use them either.