Honestly the best add-on in Firefox! It's the main reason why I use Firefox on PC. What makes it so unique and amazing is that I can for example have google search in a separate container without signing so I can search privately while having YouTube and Keep and other google sites signed in with my own account or any account I want, no other browser does this, all other browsers force every google site to be signed in with the same google account which makes it if you wanna use YouTube you have to be signed in to google search too which is terrible for privacy. And I can have any site I want open in a separate container which eliminates cross-site tracking completely, a more guaranteed way than using Enhanced Tracking Protection and uBlock Origin which are also fantastic and important to have enabled for privacy as well. This is an absolutely brilliant add-on. THANK YOU MOZILLA!!