Chrome extension has ability to "Read and change all your data on the websites that you visit"
How would you tackle this? That first bullet point is interesting...

How would you tackle this? That first bullet point is interesting...

I think that in mobile cloud computing all extensions that you add to a web browser require this type of access.
If you're concerned about online privacy then you may also need to become aware that even with a VPN or a good firewall and proxy, these extensions will disregard features like "private browsing" and such.
Your best approach is to use a Chrome-based web browser that supports this extension but also lets you to manually set additional privacy settings that can block websites from accessing your sound card micropbone, the clipboard, webcam, etc... to include the ability to add script blockers, and most importantly, to give you the flexibility to browse anonymously.
hiding your IP address from websites that you visit (like behind the Tor network for example), block automatic redirects, and the ability to disable WebRTC (non-proxified UDP packets that are routed through both of the internal and public interface hanfled by your computer's network card), are some of the things that you should configure first before you add any extension(s) to a web browser.
Then you can test for leaks and streamline security vulnerablities with a more solid approach.
This, however, still will not protect you, and won't avoid to personally identify you while online since you, as the user, is agreeing to such terms when you install and enable such extensions.
Already have an account? Login
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.