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Container Opener

This extension lets you open up a site in multiple containers at the same time. Why would someone want this? Well, if you have multiple email-accounts with one provider you can create containers for each account (using Firefox Multi-Account Containers plugin) and then open them all up at once. This makes it easy to check multiple accounts at the same time.

Install
Container-opener will open multiple tabs of the site with the specified containers. Press site name in the popup. Add sites in the preferences and select which containers to use.