[shuri]

Happy Firefox user. I love the multi-account containers and the picture-in-picture. That, and you aren't "logged-in" at the browser level.

[moallabbad]

Then I think you'll also love the Container Default Pages extension [0]. I lets you assign a default website for each container. So for example if you have a container just for YouTube, you can set YouTube to open automatically when you open a new tab in that container. It's very convenient. Disclosure: I created it.

[0] https://addons.mozilla.org/en-US/firefox/addon/container-def...

[jmholla]

The extension already supports that, albeit in a semi-convoluted way: you have to visit the site to set a default container for it. If yours let's you edit it by hand, that is a pretty big quality of life improvement.