You asked what I was wondering except I was thinking of the [Multi-Account Containers](https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/?

You asked what I was wondering except I was thinking of the [Multi-Account Containers](https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search https://addons.mozilla.org/en-US/firefox/addon/multi-account...) I think Cookie Protection does solve the problem that I used the containers for. I wasn't really using it to keep accounts separate, per se, but more to keep companies like Google from snooping and sneaking peeks at my other cookies.