When you open the site, start streaming the content, then go to Window>Activity, this will open a dialog box that will show your open pages activity. You should be able to easily find the streaming content from the extension. Try double clicking on that file, it should start downloading, if it opens a new browser window with code in it, close the new window and then hold down the Option key and double click the same file. Now, it dloads in .flv format, you will need to convert to and .avi or whatever format you want.