I'm just using Mozilla's Multi-Account Containers extension. In my work's infinite wisdom I have a total of five "single sign on" accounts. So I have different containers for each account so I avoid the endless "which account would you like to use" and "this account doesn't have access to this resource".

The extension allows me to set specific domains to always open in container X. That covers 90℅ of my use cases. Some sites I need to use different accounts with and for that I have to select which one to use each time.

Whats the point of containers if third party cookies are blocked?

Am I going to come out of this adding Amazon Containers? I guess there is an avantage of being able to use provided domain lists for the big players but it would seem that it would be better if this was a single Add-One - and part of Multi-Acccount Containers.

I'm not sure what the resource impact of adding additional Addons is

I noticed that I wasn't actually using Switch Container so I've deactivated that for a while.

I didn't even know there were addons besides the multi container built in. I have containers for multiple Google accounts, work, Facebook, and Microsoft. Certain domains auto open in certain containers.

Facebook is good and I especially like the amazon container. It's well calibrated and I'll occasionally open a website unknowing and think, "wow, I didn't even realize that [IMDB, Good Reads, etc.] Was an Amazon site."

Very helpful.

https://addons.mozilla.org/en-US/firefox/addon/contain-amazon/