http://gettingthingsdone.com/wp-content/themes/getting-things-done/inc/picturefill.min.js
http://clarksvillenow.com/wp-content/themes/saga-clarksville-now/includes/js/picturefill.min.js
https://www.praxisdienst.de/out/praxisrelaunch/src/js/custom/20.third-party/40.picturefill.min.js
http://www.casanaute.com/responsive/assets/js/lib/picturefill.min.js
https://www.edow.com/wp-content/themes/edow-2016/js/libs/picturefill.min.js?ver=2.2.0