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ShowContactFoto
Displays the contact photo/image/picture of the sender/recipients while reading/composing message.
Images are taken from local image files or Address Book (see addon's options page).
Attachment Saver
Saves all attachments from multiple selected emails as a single zip file.
It provides an extra option in your context menu when selecting emails.
Thunderbird Send
[Alpha Testing] Thunderbird send allows sending and receiving end to end encrypted files.
This add-on is undergoing testing and not yet available to the general public.
Filter Manager
SpamTester
SpamTester allows you to test the spam score of your email using popular anti-spam software (SpamAssassin, Rspamd...). This is useful to know if your email will fall into the recipient's spam (or even get your mail server blocked).
Antispam
AutoZoom
ReplyAsOriginalRecipientUp
When you reply to a mail sent to your personalized address (postfix/qmail/gmail extensions) such as john.doe+contactname@example.com, "From:" is replaced by your personalized address rather than your simple address.
Aranese spell checker
Cypherdog Encryption
ENEX Tools
Add import/export functionality of Evernote export file (enex).
* Load enex file and open message composition window with the note content
* Export messages to enex file which can be loaded by Evernote desktop client
Antidote connector
Use Antidote directly where you are writing! Run a text through the corrector and the changes you make will automatically be applied to the original text in Thunderbird. (You must have access to Antidote.)
Mark Subfolders Read
Adds a context option to folders for marking all contents of the selected folder and all subfolders as read.
Zulip - Quick Access
Quick Access to Zulip in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Webpage Opener
Balochi Spellchecker for UniBal Script
This add-on is a Balochi spellchecker based on the UniBal Balochi script.
This is a pre-beta version as the dictionary has 1000+ words and not all Balochi Affix rules are implemented.
Please use it and give your feedback
Tatar spellchecker dictionary
Tatar dictionary for spell-checking in Firefox and Thunderbird.
Орфографический словарь Firefox и Thunderbird для проверки правописания татарского языка.
Lower Sorbian dictionary
Kiswahili Spell CheckerTo create your own collections, you must have a Mozilla Add-ons account.
