Not user-friendly despite not looking very nice. I tried selecting "alway open this site in..." "private" for addons.mozilla.org. I don't know what I am doing wrong but when I go to addons.mozilla.org it doesn't switch container. If I can't rely on this than it is useless ;(. But I love the idea (right now I am using multiple browsers)!

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 extension is a life saver if you're an IT Admin that manages multiple accounts for your customers. Before I found this I wanted to kill myself managing Office 365 tenants. Now I can have dozens of tenants open at the same time without login issues.

The only reason I didn't rate this 5 stars is there is no way to easily sort the Containers list, really Alphabetical would be enough for me to rate 5 stars, but custom drag and drop ordering would be over the top. I have over a 100 containers, and often end up with duplicates as I miss them on first glance.

I think about it as of one of the best Mozilla Foundation inventions. Just brilliant (well, almost - from my POV it lucks profile list sort).

The next step I see: add add-on isolation to specific containers (so we could say goodbye to multi-profile operation finally).

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.

GREAT

It is useful to distinguish works and personal by tabs

this add-on has many issues which I've already submit on issue list. also many open PR with zero actions, add-on seems doesn't active.