I like the extension, but the user interface is insanely unintuitive and there are no instructions in the add-on's page. So you will have to spend a lot of time to figure out how to use this add-on. You can find some documentation by googling and some third party reviews that give even more insights on the benefits and use cases for this. I don't know why Mozilla makes it so difficult to get started with this add-on by not connecting it with meaningful documentation.