Essential.

usefull

Just works, as advertised. I use it to be logged into two different accounts in the same browser :)
The only feature that can seem kinda buggy is the "always open in default" which I understand to mean that new tabs will be opened in the "default" container, this is not the case and I haven't found a consistent pattern.

But that said, it opens links in the same container the source page is in, and it "just works".

One of the most useful add-ons available right now.

First: good idea. But there is no such thing as being able to "sort" the container folder. I looked everywhere.
Second, I created new tabs under the provided option, but I do not have or see the option to create a new one when I rightclick to see the container with all tabs there.It does only show "re-open a container. I don't want to reopen but create a new additional one.
I have right no pages in any tab because just installed the multi container addon.
Howand when does the option "to create a new tab" show at all?

Maybe I don't understand the concept. Should it not be able to be handled similar to a bookmark or save the tab?
It's not very clear from the writeup for options.

I don't use Firefox Multi-Account Containers to its full potential, and it's great when I do use it. Wish it existed years ago.
It's going to take some time to focus on creating meaningful containers (and applying them). From there, it should be easy.

Amazing. Was using two profiles w/o knowing this extension exists. Thanks, Mozilla.

Privacy on the fly!