Edit: Just looked at Firefox and the link is added automatically as a "shopping link addded by SkimWords". So it's an ad basically and means nothing.
Eugh, keyword advertising! I take back all I said
Hang on, that was just a test import?
Hmm, a bit odd. Presumably they will have regular backups which could have been used to test a migration, rather than making the site read only for that length of time.