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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).
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).
SimpleLogin - Easy Reach
An extension for Thunderbird that allows you to access SimpleLogin.
OWUI - Quick Access
This extension adds a simple button to your Spaces toolbar that opens in a new tab, providing you with one-click access to your Open WebUI Instance.
Mark Subfolders Read
Adds a context option to folders for marking all contents of the selected folder and all subfolders as read.
Thunderbird Send [staging]
[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.
Dolnoserbski (dsb) rěcny pakśik
Lower Sorbian language pack for Thunderbird - Dolnoserbski rěcny pakśik za Thunderbird - Niedersorbisches/Wendisches Sprachpaket für Thunderbird
DS-BCC
Data protection extension, to avoid data mishaps with circular mails:
1. warning for e-mail with multiple recipients not in BCC (exceptions possible)
2. warning for roundmails with a different recipient domain
3. warning if PGP key is present
BorderColors D
Shows a colorful border around the "New Message" window, so you can tell different identities apart.
Builds on the original BorderColors and the "GT" version, adding different border styles.
Owl for Exchange
Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).
Flat Folder Tree (updated)
Flat Folder Tree enables you to selectively breakout sub-folders under intermediate folders in the folder pane view. This is an updated version of the existing addon, now compatible with Thunderbird 60.
FileLink Provider for Box
Uploads your large attachments to your Box instead of sending them by email.
AttachmentCount
Adds a column to the Thunderbird message list to always display the true attachment count. An icon is shown for single attachments or all attachments deleted/detached. Tooltip preview of single attachment content and summary for multiple attachments.
To create your own collections, you must have a Mozilla Add-ons account.