Further searches brought me to research.microsoft.com, which says (emphasis mine):
CiteHistory is an experimental Internet Explorer 9 browser plug-in that enables MSDN and Stack Exchange forum participants to share the pages they visit in association with asking and answering forum questions. (...)
CiteHistory transmits browsing logs associated with visitation of technical forums. When a person visits MSDN, or a Stack Exchange website, CiteHistory logs the visit to the forum and an obscured representation of the past hour of browsing history. (...)
Editing out the links will be a temporary solution, because the CiteHistory project is still on-going.
What's the best way to get rid of this junk?