No, it's not that one, but I'll check it out. I use Firefox Multi-Account Containers by Mozilla [1], which is what many other container related extensions depend on.

I also use Temporary Containers [2], Facebook Container by Mozilla [3], and Google Container [3]. There are also container extensions for Twitter, YouTube, etc.

[1]: https://addons.mozilla.org/firefox/addon/multi-account-conta...

[2]: https://addons.mozilla.org/firefox/addon/temporary-container...

[3]: https://addons.mozilla.org/firefox/addon/facebook-container/

[4]: https://addons.mozilla.org/firefox/addon/google-container/