Firefox let’s some thirdparty cookies and connections pass to not break some features like for example “sign in with”.
So every website that has a sign in with Google can be seen by Google and tracked to your Google account.
If you put Google in its own container its more difficult for Google to track that, since they don’t have access to their cookies on other containers.
Mozilla has the Facebook container extension which does that a little better and also has more explainers.
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