This is one of the most amazing feature of Firefox, at work we use the GSuite and Chrome with multiple accounts: this add-on allows me to ditch Chrome entirely.
I am also converting other colleagues to it, little by little.
I am an IT Technician at Salesforce :)

Works best when you create 1 container per website (twitter, youtube, etc) and set it to automatically open in the appropriate container.

Awesome module. Just one remark, it would be nice to be able to set a default page to open.

excelent tool either to test own websites as well to enchance ones privacy.

This should become a native feature to the later versions of firefox. A must have feature that separates firefox from other browsers.