I love the concept! It's private, easy to use, and should be BUILT IN to Firefox! I just wish you could add more icons, each container has it's own individual history, passwords, etc. Also, when I sort the tabs, it moves the new tab button to the left, and I can't change it back, which is annoying. What would be nice is if I didn't have to open a new tab in a container by having to go to the container menu. If it would be right next to the new tab button, where everyone would see it would be awesome. Overall, great!

Useful for keeping cookies separate. Would be nice to keep add-on's and their data separate too. For example, MetaMask should only be enabled in its own container.

Slightly disappointed. I hoped for different privacy settings for containers (like cookies policy at least). Now it just deletes all my cookies through all containers after closing my browser.
And would be nice to have the different addons set for each container.
I still need few browsers to solve this.

Awesome! 5-stars if I could easily take an existing tab and swap/copy/move/duplicate it into a different container (right now I have to copy URL, open new tab with different container, paste and go ... blech). Other people have asked, adding my vote!

Just add sync and open a new uncontained tab as a container and it will be close to perfection!

Would be nice to be able to move tabs over to a specific container and also be able to edit the list of domains in a container.

I absolutely love containers! They help immensely with web development and having multiple test accounts. No more private windows and using both Chrome and Firefox just to test more than 2 accounts at a time!

This add-on is useful for memory management and organizing the endless collection of tabs I seem to keep open.

I look forward to how the developers can make these easier to use and organize. Certain aspects about the implementation feel clunky to me, but the need is real.

5.0.1: the only lacking feature I can think of is one to move a group of opened tabs to a new window

Would be even more useful if settings (which site to open in which container) would be synced across the devices

Works great. Some irritations - no shortcut to open new tab in specific container. Can't specify the existing web site I'm on to go to a specific container - I have to open the tab container and then reopen the site in that container. Maybe I'm missing something? Would be 5 stars if I could do the above.

It's a great way to keep cookies from different 'worlds' (i.e. work, personal, etc.) apart. Just works, and I've never had issues.

That said, not 5 stars for a few reasons:

1. URL autocomplete is shared between containers
2. Login (username) autocomplete appears to be shared between containers

Good for increasing Privacy/Anonymity online by compartmentalizing tabs into their own little virtual sandbox of sorts.