Datastore
The microsummary service stores microsummaries and their meta-data as
annotations in the annotations datastore via the annotation service.
Microsummary annotations include:
* microsummary/content: the microsummary content (i.e. what Firefox
displays to users);
* microsummary/id: for microsummaries specified by bundled or
installed definitions, the unique identifier of the microsummary
definition;
* microsummary/uri: for microsummaries specified by
<link rel="microsummary"> elements embedded in page headers,
the URI of the resource identified by the <link> element.
* microsummary/expiration: the time (in microseconds since
the epoch) at which the microsummary will expire.