The most useful extension never invented period !
Don't forget to activate the show in bookmark option which allow you to open the same bookmark with multiple sign-on.

Très bonne fonction pour séparer des contextes que je souhaite isoler les uns des autres. L'add-on n'est pas encore très intuitif, mais permet progressivement de programmer chaque site avec son contexte de destination.

That has been amazing as a both an individual and a family member! I have used previous solutions that never work quite as well as intended. Thank you as always Mozilla!!

Please add a way to re-order the list, & to stop adding the same old default categories to my current ones on new installs.

One of the most useful extensions I currently use. I do wish they would add tab stacking and tab previews, but all the same, 5 stars.

Finally, an easy way to have multiple logins into Office online on different domains!

And a complete separation between your private and tracked life!

The only thing that is missing, is the option to manually add a URL via copy & paste. Many services quickly redirect you after they find out that you are not logged in, and it can be tricky to catch them at the exact right time.

Excellente, made my life easier with multiple e-Mails and different projects open at the same time. Congratulations to Mozilla Firefox team again!

I'm A SERIOUS Multi-Tasker! FF Containers Allow Me To Work On Multiple Projects ALL @1 Time...Without Having To Log Out Of 1 eMail Just So I Can Open Another 4 Example, Just Open A New Container & Voila! Unlike Some Other Browsers - When U Open A New Container ALL The Add-Ons & Features Stay In Tact...No Multiple SetUps For Each New Account. There Are Add-On Containers To Secure Things Like Facebook Container, Etc But I Find That FF Containers Fulfill My Needs & W/Other Security Features Already Built-In To FF As Well As Add-Ons, I Feel GOOD, YAH!