Richtig scheiße, denn das fördert Clutter und Chaos bei (zu) vielen Tabs und Fenstern:
Nach Auswahl bei einem Tab von „Always open this site in …“* öffnet sich
1. ohne Warnung/Hinweis
• ein (anscheinend) Klon des Tabs**, und zwar
• dort, wo gerade Aktivität war, also schlimmstenfalls, wo er im Leben nicht hingehört.
Das könnte ich noch verschmerzen, auch wenn es nervt. Aber
2. — wieder ohne Warnung/Hinweis! —
• es öffnen sich (alle? zumindest sehr, sehr viele) weitere(n) Inzidienzien dieses Tabs; in meinem Falle waren es zuerst hunderte, weil ich zuerst die dringendste Herausforderung an Privatheit angehen wollte.
Übrigens zunächst mit der (dann ziemlich) dussligen Warnung unter dem Titel “Multi-Account Containers Confirm Navigation”* mit dem Inhalt “Open this site in your assigned container? You asked Firefox to always open CarmaChamleon for this site: (…URL…) Would you still like to open in this current container?
[ ] Remember my decision for this site
[Open in Current Container] [Open in CarmaChamleon]”*.
Und dann noch einer… noch einer… noch… noch…noch… und nochundnochundnochundnochundnoch — und… so weiter.

Das erinnert mich an Windows-Installation im Vergleich zu Mac (früher jedenfalls): Windows fragt jeweils zu verschiedenen Zeitpunkten Dinge ab, statt diese vorab in einem Rutsch zu klären…

Suggestions to the developers:
Please consider those people who — like me — are “tab hoarders”.
—> warn that possibly hundreds of tabs will open when making that choice (at least once, with remember of course), or better
—> find another way of dealing with that situation:
• open in place, why not the same tab anyway? At least in the same window!!! — I (try to) put order into the placing of tabs in different windows, so don't mess with that, please…
• and… well no “and”, that would heal the problem of cluttery and confusion.

In the meantime, address us “tab hoarders” at least by putting up a warning on first usage, better yet a set of instructions — maybe there's a better way to set it up without annoyance and confusion?
Bear in mind, we might have fairly slow computers still in use, so when testing, consider that as well…

Thank you.

And, another thing:
translation.
With German, I offer help. My English is, hm, okay; my German is excellent, I love to use precise expressions that are still easy to understand.

* Übersetzung?!?!? — Deutsch ist nun nicht eine Sprache, die bloß von 20 versprengten Individuen in weit verstreuten Hütten in der Tundra oder dem Regenwald gesprochen wird…!
Ich würde auch dabei helfen, da ich auch Englisch recht gut beherrsche.

I love this extension very much, but after updating, the "Open this site in your assigned container?" appears and I don't know how to disable it.

This page is so annoying and didn't help anything.

The "Open this site in your assigned container?" page is so annoying. I would prefer to be able to choose a default container inside and choose specifically which website I want to open on a specific container.

This is without a doubt the best Firefox extension out there.
This shouldn't be just an extension, it should be a core feature of Firefox.
Having this integrated into Firefox by default will bring probably the best differentiator Firefox can have on the market.

The only request I have is to make the container list hierarchical (closer to what bookmarks look like). Because at this point I have one container per site and it's hard to manage them.

And this could have so much potential to grow. Either do a client side suggestion engine where it creates containers for the sites you usually visit and suggest connections for sites that are part of the same user group but are on different domains (like maybe you want to connect Gmail with YouTube and with drive under one container).

Please don't ever give up on this feature. I hope you integrate it into core Firefox, but if not, at least work on improving this standalone addon. I think it's the last thing keeping me on Firefox. If this goes away, I don't know what browser will help me navigate the stormy oceans of the Internet.

Thanks for all your work!

every time I open a new link? This is so annoying!
"Open this site in your assigned container?"

This addon is the only reason why I quite brave browser and started using Firefox again.

It breaks sites when placed in a container and I am unable to remove them from a placed container. Consequently leaving the site inside a container without being able to revert it back to a normal tab. Even trying to open it as a normal tab does not work since it only reopens it in the same placed container tab.

Powerful, indispensable, thank you. I consider this functionality as core as all the other default sync items.

How do I remove "Open this site in your assigned container?" every time I open a new link? This is so annoying!

I like it and I find it useful. A better interface should be provided in order to make it easier to manage websites. If the URL is too long the deletion icon is not visible/selectable. Also it's not possible to manually add a domain or use wildcards.

It's very useful extension, It's solves the use cases works well

Good extension, but need redesign and responsible design, and zoom settings too

This add-on is not working as advertised. When closing multiple windows (or sometimes even just one) all the assigned containers are lost on restart. Also, closing and undoing the closing of some tabs causes the container to be lost as well.