Block sites outside container
Set up domains so that they aren't allowed to load content except in specific containers.
What is Block sites outside container?
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Summary
This is a companion add-on for Firefox Multi-Account Containers which goes a step further and allows you to block all content for specific sites from loading except in their designated containers. That way, blocked sites that are embedded in sites loaded in other containers (e.g. Facebook "Like" buttons, Twitter buttons, etc.) cannot see what you are doing outside their containers.
Another issue this solves is that althought Multi-Account Containers allows you to specify that a site should always open in a specific container, it does not work if you want to use that site in multiple containers, for example, to manage multiple accounts. With this extension, when a site is blocked, you can choose from multiple containers to load the site in.
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Safety
Risk impact
Block sites outside container is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Block sites outside container if you trust the publisher.
Risk likelihood
Block sites outside container has earned a fairly good reputation and likely can be trusted.