This is without a doubt the best Firefox extension out there.
This shouldn't be just an extension, it should be a core feature of Firefox.
Having this integrated into Firefox by default will bring probably the best differentiator Firefox can have on the market.

The only request I have is to make the container list hierarchical (closer to what bookmarks look like). Because at this point I have one container per site and it's hard to manage them.

And this could have so much potential to grow. Either do a client side suggestion engine where it creates containers for the sites you usually visit and suggest connections for sites that are part of the same user group but are on different domains (like maybe you want to connect Gmail with YouTube and with drive under one container).

Please don't ever give up on this feature. I hope you integrate it into core Firefox, but if not, at least work on improving this standalone addon. I think it's the last thing keeping me on Firefox. If this goes away, I don't know what browser will help me navigate the stormy oceans of the Internet.

Thanks for all your work!

This addon is the only reason why I quite brave browser and started using Firefox again.

Powerful, indispensable, thank you. I consider this functionality as core as all the other default sync items.

It's very useful extension, It's solves the use cases works well

Absolutely love this extension. It's brought a long time chrome user over to firefox.

No longer is there any need to have multiple windows open for different webmail logins.

I can stop sites from tracking me by doing web searches in different containers.

Brilliant!

I administer multiple web apps, across multiple environments. Very useful when you need to test as a user (in one or more environments), while viewing/modifying as an administrator simultaneously.

This is what I was looking for to test web apps in one browser with a different user in different tabs.

brill add on

Simply amazing. Can use multiple tabs in same window opened in multiple containers avoiding the need to open separate windows!

Awesome, everything about it is simply awesome.

About Perfect! A data privacy must have!!

It's fantastic. As an IT professional, I sign into the same portal with different accounts very frequently. This add-on saves me so much time and headache as I can use one browser for this task now instead of two or three. Highly recommend for productivity and privacy.