Puntuado con 4 de 5 estrellas
It works, after editing max version in install.rdf file, on FF 6.0a1 (2011-04-22) x64 W7x64, but context menu over anchors shows transparent menu background. It needs an update.
Also I've found it refuses to show context anchor menu over anchors on some images (if not all). For example the little graphs at the right of the table have an anchor, but context menu doesn't display http://data.worldbank.org/indicator/EG.USE.ELEC.KH.PC
@alanstancliff PCDingo is missing long ago the great earthquake