The add-on is very well integrated with Firefox, and the containers can be synced. I use containers a lot to keep my school and personal accounts separate, as well as keeping my Google account isolated from the rest of my browsing.

I used containers at work to log into multiple accounts at once, and my coworker was amazed that it was possible! He immediately asked if there was a way to do that on Chrome, so I explained the Firefox container feature to him.