About: http://webisa.webdatacommons.org/320404366

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	Many extensions on extensions.apple.com cannot be installed.However, extensions that I installed before, no problem, such as AdBlock, Bing, Echofon.
http://www.w3.org/ns/prov#wasQuotedFrom	bigresource.com