Version 2.1 is compatible with FF3.5, it has had a few usability improvements with the calendar and hopefully fixed the bug with %j. Also made a 2nd click on the status-bar date re-focus the calendar as it sometimes got lost with other windows.
Version 2.0 is for FF3 only as it uses the new XUL datepicker, older versions are available for FF2. Also fixed the problem where lots of CPU was being used when multiple windows were open and no seconds were being displayed.
Version 1.0 introduces positioning and easy access to the options via a right-click on the status-bar date. I have also made it refresh more often so that those who have the time displayed are kept informed of its passing. There is also a help [?] button on the options that displays a quick reference guide.