Privacy considerations aside, containers are great for using multiple AWS accounts simultaneously. Since we use an AWS account as a deployment container, it’s typical to have 10s of different accounts you have to jump between and it’s just not possible to effectively do ops with another browser.
Mutli-account containers is really a game-changing feature for me. I switched from Chrome back to Firefox about 3 years ago (even before containers were available) and at this point there's no going back. I keep chrome around for some sites that require it, but that's it.
Now how do I get Chrome to stop auto-installing itself in my login items on macOS everytime there's some kind of update.
Edit:
Also, if you're on Android, set Firefox Focus as your default browser! It's amazing to not have to think about the tracking consequences everytime you click a link somewhere on your phone. It's basically a new "container" for every link click. If you need the cookies, then there's a handy "Open With" menu to let you re-open the page with regular Firefox, or Chrome.
And uBO works on the regular Firefox Android browser.. Again, game-changer for me.
This is honestly a killer feature! I use Temporary Containers and load the AWS console in a fresh container automatically, making it very easy to switch between accounts and have multiple open at once. (Caveat emptor: be sure which account you're using at any given time!)
It really is. I think this is one of the features they (Mozilla) spend some more resources into. It's really unique and could drive non-tech savvy users to it.