I breaks Distrokid's claim YTube artist page, and works weird with Google, it constantly ask if I want open something in other tab which is annoying.

Very very useful! Miss some features like "move all tabs from one category to one window" or "close all tabs from category abc" ...

For this i need to use other additional addons not from Mozilla. And so here comes my negative critic:
Why needs this addon (and all other container addons) access to "all website data" and so also access to entered passwords?!

Very well integrated in the browser 👌

Genius add-on. So much better than the Chrome version with "People". With Multi-Account Containers, you can mix and match sessions in tabs within the same window, and you'll never get confused because of the indicators. Works perfectly with Tree Style Tabs as well. So happy I switched back to Firefox!

Awesome add-on!
You can set an URL to use a specific container, I love the safety and privacy this add-on brings!
I wish I knew this before, a friend of mine told me about it.

Estupendo!, usando esta extensión puedo tener varias cuentas en una misma pagina abiertas al mismo tiempo!

Excellent feature. But where did this icon set come from? I understand fingerprint, briefcase, $, shopping cart, and glasses (probably something along the lines of personal, work, banking, shopping, incognito). Some how apples and school has gotten symlinked by our culture. And fence kind of works for private/secure tho its a little bit of a thinker. But airplane. gift, fork/knife, dog, 2 trees, and blob? What kind of obscure use case would make those icons fit? Give us:
magnifying glass (re/search)
newspaper/bookmark (news/reading)
GPS signal (local/geograpically identifiable)
Crowd of people (social media)
Heart (of course for favorites. Or porn. Or favorite porn.)

I feel an essential feature i believe this extension needs is the option to allow saving closed tabs exactly in the way they were closed, the same way multiple Firefox profiles generally allow you to, i don't think it should be a compulsory part of the user experience but it would be nice to have that option, since you could remove a tab and store them basically in this limbo state until you need them again, thereby not re logging every time . All in all an excellent extension i definitely think this is a move in a positive direction and do encourage others to try it out. The add-ons helps you isolate your online profile and it definitely lives up to what it pitches.

Fantastic extension. Greatly superior to needing separate browser instances logged into each different account. 100% recommend this.

Best Idea for browsers

This is an addon that should, IMO, be a feature built into every modern browser.

My only issue with it is that I have never been able to get it to sync properly across devices. Even so, it is invaluable. Just this extension alone is worth a donation to Mozilla.