Extremely helpful for web development. Makes it trivial to access the same application with different credentials at the same time.

Amazing. Missing feature to set a start page for Container type

Easy to use - works every time

This add-on alone is a reason to use Firefox

Really usefull extension, I use it every day to separate the activitites I do on internet. The only feature I really miss here is containers ordering. Now I have 8 containers and they seem to be in different order every day, due to synchronization between computers. When I open new tab in specific container, I always have to search, where it is today ...