Many times we have talked about extensions for Mozilla Firefox, although this time we have to talk about an extension for Mozilla Thunderbird, the mail client of the Mozilla foundation.
Birthday Reminder allows us, through a list, to show us the next birthdays that are about to occur. To do this, you only have to add the date of birth in the personalized fields of the contacts, by default the first field.
Thus, not only will we have the list of upcoming birthdays, but we can also schedule alert messages for some of them. The bad thing is that it only works in versions of the 1.5.x branch
Via | FirefoXtensions Link | Birthday Reminder translation website