This (https://youtu.be/FZ-zvx1QCcA) is one of my favorite Mozilla Labs concepts published around 2008, which showed how the web browser should be in future.

Today, in WWDC Apple revealed Safari's new collaboration API implementations which is quite similar to 2008 Mozilla Lab concept.

- Mozilla Lab concept: https://youtu.be/FZ-zvx1QCcA

- Safari implementation: https://youtu.be/q5D55G7Ejs8?t=4887 (1:21:27) and https://youtu.be/q5D55G7Ejs8?t=5763 (1:36:03)