Honest question: What's the difference between this and Chrome with the profile switcher enabled, minus the auto-URL bar hiding? It seems very similar to me.
Browsr's aliases are entirely separate identities. You can use fake names, addresses etc and provide these data to web services if you choose.
For example, for websites integrate "Browsr Connect", users can visit them for the first time and can be automatically sign-in without ever needing to register. The web service can automatically request information (like name, address, gender etc.) and Browsr provides these based on the alias selected by the user.
So Chrome profiles are basically for multiple users using the same browser, but Browsr is for the same user using multiple identities on the internet.