Script Summary: Kills all `` data: '' elements on selected site.
Modern browsers allow webmaster to use data protocol (like data:image/jpeg;base64, and base 64 data goes). There are concerns that it can create more abuse than use, once it is used for ads. data: protocol can be easily forbidden for all sites, but how to do it for some sites? This script gives an answer, though scripts on page still can create images after this script has cleared the page.