[bwl]

Great advice, and Containers has actually graduated from experiments to a full release.

https://addons.mozilla.org/en-US/firefox/addon/multi-account...

[sf_rob]

The add-on still has functionality / faster iteration that isn't quite baked into the release version.

If you want to be more aggressive, you can also toggle the configs privacy.resistFingerprinting and privacy.trackingprotection.enabled which will probably break some websites.