I think you're referring to Containers. If so, you can always fallback to separate Firefox profiles (run `firefox -p` to open the profiles menu iirc) if Contain

I think you're referring to Containers. If so, you can always fallback to separate Firefox profiles (run `firefox -p` to open the profiles menu iirc) if Containers aren't flexible enough for you. I've been a 95% happy Containers user since it was a Test Pilot experiment but there are certainly cases where it's not enough. In my case, not being able to use the mobile device emulator in a container tab was a big pain.