I've been using it for a few months when suddenly my custom containers disappeared and now I need to create them again.

FIXED: I had to log in and get it synchronized. My containers are back.

This extension is a must-have. It is very useful to separate your work/hobbies/customers so that you can use the Google, Microsoft or Atlassian suites each with only what concerns each ecosystem. All this separate from social media. I couldn't do without it anymore.

Great. Have really just got to using it a whole lot more since started new job - very good for organizing your projects. Simple, Intuitive. Stable so far, no issues. Recommended.

There are a lot of great things about this extension, but there are a few things wrong with this extension:

1 - Reordering the containers via Manage Container does not reorder the context menu when clicking on a link which you want to open a specific container.
2 - The Ctrl + Shift + # shortcut also does not use the same order, which makes the shortcut after reordering containers totally useless.
3 - Urls with paths cannot be assigned to default containers, making them very hard to use with sites that have the same root, but different authentication per path (which you thus want to open in separate containers).

These issues already exist a long time (and looking at the VPN stuff that is being added instead of fixing these) this extension will probably never work any better..

Which is a shame, because its a killer feature.

This is a great app and works very nicely with how various sites redirect you to their sub domains etc. The only thing I'd like added is
(1) being able to delete cookies and cache for a container group
(2) being able to assign different containers not only for different sub-domains, but different URI's

Not bad. The only question I would have is - can you have wildcards for "always open *.example.com" in container XYZ?

Absolutely necessary extension thanks! The only thing I wish would be to have entire windows automatically opening new tabs in the container of the other tabs of the window

Very useful

I love the idea of this add-on. It is a browser-defining feature that is a big reason why I am a loyal Firefox user.

But, it pains me to write this--Multi-Account Containers is _extremely_ buggy. The add-on crashes constantly (closing all of your container tabs and deleting all your custom containers), sometimes containers are mysteriously duplicated hundreds or thousands of times, sometimes it forgets which sites are assigned to which containers (forcing you to reconfigure them). At one point I had to delete my Firefox account, losing a paid subscription to Mozilla VPN, because MAC had corrupted my sync settings. BTW there are >700 open issues reported on GitHub: https://github.com/mozilla/multi-account-containers/issues.

But--despite being a buggy mess, I still love this add-on for what it does when it works, and for what it could be one day. So I can't give it anything less than 3 stars.

This is add-on is not only amazing, it is essential.
I use it for two reasons:
1. The massive privacy boost.
2. The ability to separate my work and private life. I also use containers for finance and shopping.
Before this add-on I would have to either use a second browser and log-in to different accounts in private mode.
I love this add-on.