Works excellent out of the box. You don't need the Firefox Multi-Account Containers extensions, works with built-in containers as well.

Excellent for multi-accounts for the same domain. But if you add a rule for "reddit.com", the log in button won’t work until you disable the rule.

I have been looking for an extension that does something like this for months! It even works with sites with subdomains like Tumblr, Bandcamp, and NewGrounds.

Very useful. Thanks!
I have a suggestion: Block all domains outside of the subdomain I'm browsing to.

Great!
[Feature Request] Set up process is quite tedious, please consider adding a bulk import and export method for the domain/container rule list, that can be easily setted up by importing a text document or a simple copy and paste. In fact, it would be great if this addon can read rule sets from the addon "Containerise", which is basically just written per line :
"domain" , "container"

Please do consider. Your addon is quite essential to the container feature, and I have no idea why Mozilla is not doing this already officially.

giving this extension a try, given that the developer made a good case for its usefulness. so far i've completed the basic setup and all is working well.

first impressions on the options interface:

- multiple rules gets a little clunky-looking, though i can easily find any rule via FIND if i know exactly which rule I'm looking for (which may not be the case a few months from now)

- the view of clickable container tags gets truncated if too many containers exist and the rule box elongates past the allowed height of the box. i might suggest smaller tags or some other workaround

- i copied the domains in the example pic for my facebook rule but, being uneducated on associated domains for the various sites i visit on the regular, any tips on where to hunt down lists of other common associated URLs would be great.

many thanks to the developer!


EDIT: ok, i'm on my fifth rule, and the whole rule area got truncated... can't add my 5th rule since the page is gray from half-way down the domains textbox on down. FIX?