A whole world in a container - and then another whole world - and another - all color coded!

Probably the biggest reason for using Firefox. Don't have to switch profiles, etc and let's me have a single window where all tabs live;

Super helpful to manage multiple accounts across the same website, MS, etc so there's no overlap between the different tabs

very informative

Very good add-on, 6 points from 5

Absolut unverzichtbares Tool und Alleinstellungsmerkmal von Firefox.

Truly helpful add-on. Love it.