There's the first-party extension, Multi-Account Containers[1]. [1] https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/ https://addons.moz

There's the first-party extension, Multi-Account Containers[1]. [1] https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/ https://addons.mozilla.org/en-US/firefox/addon/multi-account...