About: http://webisa.webdatacommons.org/280625425

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Before a web request there is no page where you can inject your content script, and I do not see any reason why you need to get this from a content script.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com