Functionality is ok. Wildcard domains is needed. Like *.tumblr.com.

Also, using "manage containers" to order the list of containers does not seem to get picked up afterwards by any other menus. Trying to re-open a tab in a different container? The list you get is out of order. Only the list in "manage containers" seems to keep the order you gave.

It's buggy when I try to hide and show a container that contains a local pdf. Please fix! We should also have the ability to use the same account for all the containers, because I only use this add-on for organizing tabs.

Adding an already opened page to open in a specific container in future should be an option. As of now it only shows option to add to default continer.

Very useful for privacy and multiple accounts on the same service. I only wish the containers and settings would sync through Firefox to other browsers. It's a big pain to add them by hand to multiple computers.

The concept is great and execution has come a long way to make it a generic version of "Facebook Container" addon. A nice way to set and manage user preferences is needed, though.

I really like this extension. It's potentially a much better solution to the "I want to keep my work and personal lives separate" problem than other browsers (see profiles in Chrome). I hope the interface for setting default tabs for domains becomes a bit more robust, and that the interface improves for opening existing tabs in specific containers. I know these are under discussion so I'm optimistic. :)

Absolutely great add-on!
Should be a built-in (or added by default) feature.
It's my No#1 tool for keeping services separated from each other, e.g. Facebook separately contained, News websites with their tracking cookies separately contained, other user accounts/profiles in various other websites and/or services w/o any association between them all.
It's like having multiple, persistent "Private Browsing / Anonymous" tabs with the ability to define a persistent default container for every website (e.g. clicking a Facebook link will always open up in a pre-defined Facebook container tab).
I love it and use it all the time!