This configuration is the Extension Manifest Registration. This works, but the content script will be injected into every page regardless of whether or not the Page Action button is clicked
added a simple message passing example in the background and content scripts to faciliate communication within the extension
got passing shell functions set up in popup.js as well
All parts of the extension are now communicating successfully together. The next step is to display only those pictures of sufficient size, and then get the downloads working properly (hook in dropbox)