Most needed. My only concerns so far are somewhat confusing flow of using it and lack of settings sync between different instances.

Honestly, this is something I didn't know I needed until I decided to try it out. Lets me easily see what kind of Firefox browsing window I have open, whether it's mostly an entertainment window or just a random browsing window. Essential for someone that likes to have multiple browsing windows.
Though it is a great add-on, it could really use more symbols and colors. I find I struggle with categorizing entertainment-type tabs. Overall, great.

Love love love this addon. It does everything I need it to do and I don't have to have a bunch of different browsers open all the time.

For the developers: I would be even more in love with this addon if I could containers for my homepages so every time I open it, all my various email accounts pop up. Consider it an official feature request!

Works great. I do have to agree with another reviewer and say that being able to configure cookies and such for each container would be nice.

just awesome!

It does exactly what I wanted, but working with it is so cumbersome. It requires too many clicks for simple operations, like opening a tab in a specific container, or switching containers. I think having windows that will open by default the selected container would speed up my workflow. It should also come up on more contextual menus, and definitely showing your options directly, and not as a submenu. It works flawless and it allowed me to ditch Chrome, which is what I wanted, but the UX is not as good. I am looking forward to seeing this extensions as part of the stock browser having a much better integration.

Everyone should use this.

add proxy each container,
add canvas fingerprint different or random each container,
add user agent different or random each container,
sync to firefox acc or local file backup

will be perfect!!!!!

Love it... lots of potential but not yet there. It requires better integration across other elements of the browser and is somewhat buggy. Example, wild cards URLs, bookmark editing and better container mngt (eg. am I signed into Google (as who) in this container?).

excellent....helps me a lot to maintain my online shops with several user accounts....keep it up...