From MozillaZine Knowledge Base
Firefox 2.0 introduces Microsummaries for bookmarks — a way to extract a bit of information from a web page and display it in the bookmark’s title. The service can output debug information to the console when this preference is set to true.
Possible values and their effects
Direct debug information relating to the microsummaries service to the console.
Do not output any debug information for microsummaries. (Default)
First checked in
Has an effect in