I decided to use Firefox for real these days and really learn about its features. This extension particularly is a selling point for me. I told my girlfriend about it and she was impressed about how it improves workflow and how Chrome has nothing even similar because their addon SDK simply doesn't allow it. I am impressed too

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"Multi-Account Containers" has improved my workflow, making me more efficient. By being able to keep my cookies and histories isolated based on activity/website, I don't have to open a private window every time I wish to look at Gmail or use a Google search service like Google Scholar. The ability to specify for a website to automatically open in a chosen container is an excellent additional touch that facilitates the process even more. Finally, it also works well in conjunction with my tab group extension ("Simple Tab Groups") -- I have been using both for several weeks with zero conflicts or other issues on either a Mac or Ubuntu 18.

This add on does exactly what it is supposed to do. Perfect! I can use Google services, Facebook, Twitter, and others all in separate containers.

As I manage personal, work, and educational Office365 accounts, this extension is essential to efficiently manage my online life.

Edit: It shows the "Installation aborted because the add-on appears to be corrupt." error if you've changed the extensions.allowPrivateBrowsingByDefault toggle in about:config. Now it's working fine.