Such a great add-on! It's a powerful shot to those companies and individuals that want to exploit our personal information for their monetary gains.
I've been reading and studying the github wiki for a few days to better understand how to get this to work with Mozilla's multi-account containers and just figured out how to get the two extensions to work the way I want. At least I think I have. I have to experiment with it more.
I think you need to understand how regular expressions work to understand how this addon works. As another reviewer wrote, this is not the easiest extension to figure out, even with the links to its github wiki embedded into its configuration tabs, which makes it easy to find the exact information you want. However, the dev stated in response to an earlier review how to reach him via github to ask questions if you have questions about working with the addon and the doc is unclear to you.
Thanks for the nice review! Just wanted to quickly point out that you only need to know regular expressions if you configure Advanced Per-Domain Isolation Patterns, which is really only relevant when your goal is to isolate based on paths or ports, rather than just domains. If you have suggestions on how I can document that more clearly, I'd appreciate if you let me know.