It's a great idea indeed. But the paranoid _like myself?_ would probably not recommend it as it runs on...well...a browser. I'm not at ease with the chance that a code change someday would / could allow a copy of my file to be uploaded anywhere.

As for having the browsers run in "offline mode" (proxy equal 127.0.0 1?)...neat but I would vote against it. My fridge just needs to keep stuff cold, my toaster should serve bread, my Internet browser should not be an app.