Thisextensionwill do nothing more thanlookfor any keywordsdefinedfor this class, andusethemtoadd a newdocumentationtagassociatedwith the classin the source code.
So, by replacing the keywords that the the extension is looking for in your newsfeed and changing the RSS feed(s) that it pulls the replacement images from, you can essentially hack the incoming images in your Facebook feed anyway you want.