Semantic Radar is a semantic metadata detector for Firefox...when detected, shows an icon in browser's status bar. Currently it supports SIOC, FOAF and DOAP metadata.
J. Breslin, A. Harth, U. Bojars, and S. Decker. Second European Semantic Web Conference, ESWC 2005, Heraklion,
Crete, Greece, May 29–June 1, 2005. Proceedings, (2005)