Android Add-ons

Birthday Reminder by Sebastian Apel

Birthday Reminder reminds of upcoming birthdays for all contacts in Thunderbird's address book. Supports Lightning, reminders and even Google Calendar :-)

Collector's Note Not necessary for emailing, but useful for the Lightning Calendar

SmilieInserter Plus by Throoper

Insert smilies in messages.

Dictionary Switcher for Thunderbird by Dao Gottwald, MrWarper

Toggles spelling dictionaries automatically or manually and displays the currently selected one in the status bar.
Now merged with Dictionary Switcher v1.3 for Firefox/SeaMonkey

Clean Subject by sbiz

"Clean Subject" cleans the subject from multiple occurrences of subject prefixes such as ("Re: Re-2: Re:") and postfixes that are inserted by other clients. Words like "[SPAM]" can be cleaned as well. These prefixes can be defined in the preferences.

Chromatasks by Philipp Kewisch

Color task rows with calendar color

Collector's Note Not essential, but helpful cosmetic for Lightning

Follow Reply by pastisman

Find the replying or the following mail you wrote by clicking the arrow icon in the subject column of the thread panel