Amazing add-on. One of the main reasons I'm here using Firefox instead of Chromium-based-browsers. Hope it never gets unmaintained.

It's a great addon but please add a way to manually add URLs to open in a container, sometimes websites do quick redirections between domains (see Google) and it's impossible to add the redirecting domain to the container! Also wildcard support for manually added domains would be great (eg: *.google.com). Thanks!

I love it! Only thing is: it does not seem to work if a webshop is using Adyen as a payment method. At least with the 'shop' from dpd.nl dpd.de which uses Adyen.