@maiyannah Yeah I'm thinking maybe the microsummary was intended to be a "live" description of the page. Like you have the meta description tag for "what is this?" and the microsummary for - say - hovering your mouse over the bookmark and it accesses the URL to give something like the latest headline news for that bookmark or something.

Firefox pretty much killed any such purpose with actual live bookmarks (which is how I consume my RSS/Atom) :P