Fixes notifications and data sync on Firefox.

• Reminder notifications now appear and play their chime. The extension was
  passing an option Firefox's notification API doesn't accept, which stopped
  notifications from firing at all.
• Your notes and reminders now load. Firefox asks for site access separately
  from installation, so the extension now requests it when you tap "Test
  notification" — grant it once and your Calenote data syncs as it should.

First Firefox release. Adds holiday and festival markers, including the weekly Saturday holiday.