Take data from one page and move it to another.
Use jQuery to take data from one page and access that data on another.
Example:
When clicking the extension, store the URL and page title of the page you were on. Then, a new window will popup based on the URL specified in the extension options. In this case, the page has a form on it. We can take the data from the original page and inject it into the form fields using jQuery.
The possibilities are limitless: whatever you can do in jQuery, you can do in the extension.