It's exactly what I've been looking for, but I have a few gripes about it:

1. Moving existing tabs to containers is a real pain (new users). The only way I know is to Right click tab > Reopen in container, but this produces a duplicate and then I have to delete the old tab.
2. It's very slow to toggle containers on/off and you can't see which ones are currently switched on. it could do with a simple toggle method which would grey out the group or show a hidden icon next to it. Personally I would like to use 1 group at a time and leave the others off.
3. Very limited list of colours and icons for containers. It needs basics such as music, films, news, coding, videos etc.
4. I've moved the icon to replace the new tab button in the toolbar using Customize. Could the CTRL+T shortcut be linked with the addon as well?
5. After adding loads of tabs using above method 1 of my groups is totally empty, others seem suspiciously empty (1-2 tabs only), I have lost quite a few tabs by using this.
6. Not compatible with "group speed dial" for opening new tabs
7. When reloading the browser tabs fall out of containers and they become empty, defect?

excellent tool. use often to logon to multiple gmail accounts, along with social media sites that I have two user IDs.

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.

Perfect to keep work and personal separate.

Не хватает только возможности сортировки списка контейнеров.

I missed this feature so much from Chrome, finally I realize it was here all along. It's stylish and works great. Love it.

Excelente plugin! Agora no meu browser, o google, facebook, jornais, sites de compra, trabalho, fica cada um isolado no seu cercadinho.

At first I though this looked like it could be useful, but after installing it I didn't really start using it and just kind of forgot about it until recently.

After actually using it for a while I can confidently say it's absolute gold.

Must have sur Firefox, j'avais quitté Firefox pour Chrome il y a de nombreuses années maintenant sans trop m'intéresser aux évolution de Firefox, à tort je le réalise maintenant.

Je reviens sur Firefox maintenant et cette extension ne fait que conforter ma décision !!!

Je voulais un système de ce genre depuis longtemps, je peux enfin efficacement combattre le ciblage sur le web. Un plus serait d'offrir une option qui isolerait tous les onglets non associé à un conteneur, mais ce serait peut-être trop gourmand en perf.

I slept on this one for too long; container tabs are awesome! Totally streamlines my workflow without compromising on (a reasonable degree of) privacy. As someone migrating from the noscript-and-autodelete-cookies-on-everything way of life, this is sooo much better. Thanks, Mozilla!

Would be nice to add more colors to edit the tabs, but still really beautiful!

I would like to have more control if Firefox is installed on different computers in different languages. I have different names for one logical container: f. e. "Arbeit" and "work"

I love this extension. Perfect for isolating my accounts with Google, LinkedIn, Amazon, etc from all of my other browsing. There are some small UI tweaks and conveniences I'd like to have, but they've all already been requested in the project's github issues.