The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.
ThunderBirthDay is an extension that displays birthdays from the Thunderbird address books as events in Lightning. Install Lightning, MoreColsForAddressBook and ThunderBirthDay, and then create a new local calendar choosing ThunderBirthDay as provider.
Full Specifications
What's new in version 0.8
Version 0.8 added Finnish locales and updated compatibility information for Seamonkey 2.5 and Thunderbird 8.0.
General
ReleaseOctober 21, 2011
Date AddedOctober 9, 2011
Version0.8
Operating Systems
Operating SystemsWindows 2003, Windows Vista, Windows, Windows Server 2008, Windows 7, Windows XP
Additional RequirementsSeaMonkey 2.0 - 2.5. and Thunderbird 3.0a1pre - 8.0