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New tabs and windows will have the same container as the current tab. Links opened from external programs will also try to keep the same container as the tab which had focus.

Multi account containers are useful, but it's easy to slip out of a container. This add-on does two things to help with that:

1. When opening new tabs / windows, it makes them use the container of the tab you opened them from.
2. When an external program opens a link in Firefox (mail client, etc), it opens in the container of whatever window it opens in.