I just pushed out a minor update, bringing the version up to 1.6.2. This update fixes the context menu support, enabling you to add any link, page URL, or selected text to a new note.
I have been remiss, I’m afraid. While I did mention version 1.6′s new features, I didn’t explain the additional permissions required. In order to enable this new functionality, I had to add the “tabs” permission. You can read more about the permissions on Google’s help page.