Add-ons add functionality to, or change the appearance of, Thunderbird.
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- Transliterator Provides transliterated keyboard input mode and transliteration/detransliteration of document text.
- Add-ons for Thunderbird Add-ons are extensions and other additions that add new functionality to Thunderbird or change its appearance.
- BirdieSync Pocket PC and Smartphone synchronization of cards, events, tasks and mails with Thunderbird, Lightning and Sunbird.
- Lightning Project to provide the functionality of the Sunbird calendar application as a Thunderbird extension. Includes download and FAQs.
- Thunderbird Themes Themes are skins that allow you to change the look and feel of the browser and personalize it.
- Mail Tweak Provides a variety of fixes and enhancements.
- QuickFolders Eliminates the clutter of the folders sidebar by having the most important folders as tabs.
- ConfidentSend Removes hidden data and metadata from E-mail attachments to prevent unintended data leakage.
- Enigmail A security extension which allows the use of authentication and encryption features provided by GnuPG.