No. No. No. *facepalm*.
1) Don't try to make a knock-off of someone else's idea unless it's truly superior or you got the marketing muscle to sweep the competition off its feet. As much as I like Mozilla, they lack both compared to Google.
2) Why would you want such a browser based OS? As the reviewer said, Mac and Windows (and Linux!) are learning to play nice with web apps, but offer so much more on top of that. And lightweight? There are plenty of Linux distro's designed specifically for being light. They make Chrome OS look bloated, yet offer full desktop functionality.