Version 0.9.3:
(*) Option for audio notification for alarms and alerts
(*) Now an explicit preference in the Options dialog to specify the location of the reminder file -- this can be used to share the same reminders between Thunderbird and Firefox, or across multiple profiles, or operating systems
(*) Sweet new alert slider. Now looks like the tooltip (can span multiple lines) and you can click on it to bring up the Edit Reminders dialog

Minor improvements:
(*) Significant performance improvements in the Edit Reminder dialog
(*) Better synchronization between Firefox and Thunderbird
(*) New localizations - Slovak [thanks to Slovaksoft], Chinese (zh-CN, zh-TW)

Bug fixes:
(*) 12826 - Tooltip wouldn't show if you disabled status-bar
(*) 12691 - Reminders marked as Remind Until Completed with a date of last year would not show up in the Edit Reminder List
(*) 12710 - Reminder ics file could not properly be shared between certain OS's
(*) Toggling Show Alert on status context menu did not disable alerts