This extension does not work.
Try the following on firefox. Log into an Amazon account in a container in one tab, then open another container tab and log in to another separate Amazon account. Go back to the first tab and refresh the tab. The result is that the first tab now shows the account info of the second tab Amazon account.
So in effect these multi account containers tabs do not isolate anything at all.

No complaints but for the love of God. Can we please have this on android already!

*Edit

Changing my rating to 3 stars because containers constantly break the User-Agent Switcher and Manager addon. I really thought that issue would have been fixed by now.

Also fighting with this app at root domain level is a nightmare. Doesn't know the difference between Google account 1 and Google account 2.

La extensión me encanta pero no funciona bien con sitios donde tienes que entrar con SAML2

Honestly unclear how to use this ext properly. Seems as though Mozilla VPN client (stand-a-lone app) must be turned on in order for containers to fully function as expected (that is the VPN client I'm using). But the VPN app already encrypts all traffic. If this ext is just to segregate tabs for quick access and set specific endpoints then great job Mozilla. I was more interested in having the web traffic routed through VPN without needing to have the VPN client active. Like if you are gaming on one screen while shopping on another, esp. if the game requires Anti-cheat, having the VPN enabled doesn't work. Maybe its just my understanding of what this is intended for...? pssst... new feature Mozilla :). In any case it works great for keeping tabs organized into buckets, as well as setting individual VPN endpoints for each.

annoying 4 preset containers, cannot hide and coming back every time i install the addon again, even with sync enabled. Whats more, sync experience was back.

Lots of power when you need it, basic tab containers when you don't. Sane defaults. Seamless integration with Firefox containers and Mozilla's VPN.

CPU Per% is very high想请教一下这个功能和edge自带的多用户配置的区别是是什么？

These tools are very powerful, and many people hold containers very highly as these are so helpful for privacy, organization, and control
:)
this is an amazing addition to firefox, thank you

Wish this worked consistently. Sometimes, just keeps opening tabs in the same container over and over again.