"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.

Ok

This is really useful for having multiple accounts. Per-site containers could be a nice addition?

This is a great add-on that has improved my workflow immensely. It allows me to easily separate multiple accounts on same sites both between personal and work, as well as within each of these life domains. Saves time and keeps cookies separate, too. Sync between different machines could stand to be improved a bit, in my experience, as any new containers a make on top of the default categories don't seem to sync to my other devices. Still, this is only a minor issue for me, and not enough to take a star off. Recent improvements that allow you to choose where to open a site with right click, and to reopen a site in a different container have also been very welcome.