Sorry to bother you, but you're doing it wrong, these UserScripts changed my life !
Easy Flickr Download :
http://userscripts.org/scripts/show/116629
Flickr Remove Spaceball :
http://userscripts.org/scripts/show/3864
Works on Chrome and Firefox (with Greasemonkey), it adds a "Download" button to download disabled images and also and "Original" button on download authorized images to download the biggest ones, as shown in the pictures below :