Changes

<strike>The alarm system is currently undergoing a rewrite in [https://bugzilla.mozilla.org/show_bug.cgi?id=298358 Bug 298358].</strike> The referenced bug is no longer active, as it has been marked resolved. <!-- Can someone "in the know" please replace this section with more current information on where to find the current pieces of the alarm system... with at least roughly the level of detail in other similar sections of this page? Thanks! -->