Very cool add-on and project Rated 5 out of 5 stars
I really appreciate this add-on and the Open Attribution project overall.
It's cool to see the CC icon show up in the location bar on pages that have CC licenses in place for its content instead of having to search the page for licensing info, and even cooler to have quick access to a copy and paste attribution link.
Now I can easily see the CC terms of reusing, modifying, and redistributing content from sites like deviantART.com, SoundCloud, Wikipedia, Wikimedia, Flickr, and others.
Thanks for developing this very useful add-on and project.