The Sitemail Notifier extension adds a button (shown above in the preview image) to your toolbar that indicates when you have new sitemail messages at Propeller.com. Clicking the button will bring you to your messages page at Propeller.
To make use of this extension, you must be logged into Propeller.com. If you do not have a Propeller account, sign up at http://www.propeller.com/signup
Accounts are free, and it only takes a few minutes to create one. Once you have a Propeller.com account, you can submit stories and videos, vote for other people's stories, rate comments, comment on stories you find interesting, as well as use this extension.