It's a good tool to separate the browsing spaces, however, I find it somehow half-way between the private mode and the regular mode.
For example, I have opened multiple sites in several containers, then I have checked the cookies set by various sites by going to Options -> Privacy and Security -> Cookies and Site Data -> Manage Data. I was surprised to see them all, without any classification. The extension doesn't allow a per container management of the cookies.
I was also expecting it to let me choose which other extension is enabled in any of the containers, but I guess that feature might need an implementation at a lower level.
Later edit: I often start a regular tab because either I forget to long click on the "+" button to start a container tab or I press Ctrl + T (I am used to it). Maybe the Ctrl + T shortcut should open a new tab having the same type as the current one.

I have added a "Social Media" container. I've added Facebook, instagram, pinterest and twitter. All work correctly except twitter. I add it to the Social Media container. Close the tab or browser, reload twitter and it is not opened in the container. The extension checkbox "Always open in "Social Media" is NOT checked but there is no colored indicator on the tab. When I edit the container, the list of included sites does include Twitter. Every other site works correctly

Needs more color options, ie full range color picker, can't seem to open mozilla addons in a container

Exceptionally useful when it works. It will occasionally reset itself and you'll loose all your container tabs. One thing I wish it did have was the ability to organize the order of the tabs. I'd like to be able to keep all my admin tabs together, and the regular user tabs together. a drag-n-drop ordering system would be welcomed.

Shortcuts would be awesome

It's fine but I would upgdade it with there things:
-I want to change the order of my containers in the menu.
-I want to open a new tab and identify it with the current container.
-I would love more icons.
-From history menu or bookmark, I want to decide in what particular container I want them to open. They always open in a no-container tabs.

I really love this extension. The biggest problem is that containers and settings do not sync with Firefox Sync.

A great addon, but it's missing a few features:

- Container sync
- Ability to manually edit container assignments and use wildcards. E.g. it's useless for something like Salesforce where every sandbox and scratch org has its own domain.
- Ability to assign URLs, not just domains, to different containers.

This is really well implemented -- bravo, Firefox! I'm betting you're using standard MVP approach for releasing this. You've got two more features to add for this to make me leave Chrome behind for good: 1) bookmarks per container; 2) syncing between Firefoxes on different computers.

I know you'll get there and am looking forward to it!

Please please please add support for syncing containers across devices. Containers are amazing and perfect on a single device. But as soon as you have multiple devices it becomes a pain to set them up and manage them on every device. I think ideally there's be an option per container for whether to sync it or not.

This is a fabulous concept, and it works well. But it is missing a key feature that I have come to expect in my Firefox experience: namely syncing. The setup of containers should be able to sync between the Firefox instances in my Firefox account, just like add-ons and regular preferences.

Excellent Add-on, a must have! It would be fabulous to have an android version as well.

Makes using this functionality easy. Needs Firefox Sync! Need to add ability to set a preference for each bookmark, which container to open in when clicked!

Would give it five stars if there were an android version.

Everything seem to work fine. Perfect for separating your google Drive, Docs, Gmail, Calendar and other services from the Google search engine. I have not encountered any major bugs but you should double check that the container that is set is opening the first time you're using it.

I'm also using this plugin in conjunction with the Facebook container plugin to keep Facebook from snooping on everything I do.

if you're using this plugin don't forget to log out from google before adding it to a container so your regular tabs isn't logged in.

Essential plugin as long as profile switching is a bit cumbersome i Firefox

Would be nice to be able to a specific container to bookmarks since it's only possible to pin domains to containers, which means that services like azure devops that relies on the url for deciding which account you're trying to go to cannot be automatically opened in a certain container.

dev.azure.com/company1
dev.azure.com/company2

This add-on is really, just one thing is missing for me, the ability to add rules like "'*.example.com' must be in work container", you have to whitelist every subsite, that you want to open in the same category

It's a nice sense of security knowing that different parts of my browsing stay contained and there aren't cookies tracking me everywhere.

I'd give 5 stars if we could easily edit and share lists of sites pinned to each container, rather than having to visit each one first and then set it to always open. It would be great to download a long list of shopping sites and have them automatically relegated to the shipping container.