As mentioned by others, it does not have any instructions for use and appears to do nothing at all... It's a real shame as MS withdrew their OneNote extension for FireFox recently and now there is nothing to replace it.

To the Author:
What does this extensions do? NOTHING?
It is waste of users time to install then remove.

if you are interested in developing an extension for one note, look at Chrome extension called Send to Onenote. It will be great success if you can emulate it. it can send a page text to onenote on the desktop.

Doesn't seem to do anything :(