I think this is novel and quite a good one.

Excellent.

Very well done. By far the best extension I've ever used. Does exactly what it needs to do. This extension is one of the main reasons I no longer use Chrome. Finally I can have multiple YouTube accounts signed in instead of having to pull up a private browsing window. The features it add should be added to regular Firefox. My suggestion is that they add the ability to have a default container that all tabs open in, and be able to set up multiple containers that begin already open when you launch Firefox.

i am a youtuber and i manage lots of yt channel.
for me , this extension is a blessing..

Definitetly 5 stars for it!
Add 3 more functions, please:

1. Drag and Drop the containers in the containers list, to rearrange them as we like best!

2. The "+" (plus) button inside each container (to editing section) to be able to add the URL links directly in the container, with copy-paste, without needing to "open the URL in the container we want to be placed, etc." and gaining more time in this way, when we need to work with tens of pages!

3. More specific icons, for multiple scenaries, like: games, dating, socialize, etc.!

THANK YOU for this magnificent add-on!!!

Hi please make this work in privat browsing too

great idea.
will be great if you can configure the containers and add and edit patterns for sites automatically open in the groups (general configuration for containers)

another improvement will be to add a private container.
open some files in this container and clear after close.

Great, how about subdomain attachment? We have site d3.ru, which have undefined subdomains, as gif.d3.ru, mascotte.d3.ru. Each of it - standalone feed with global authorization. Now I add each of it to container. Need assignment editor and wildcard support!