Add-ons
Privacy and Security
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Rspamd-spamness
Secure Addressing
Requires Restart
This add-on provides features to avoid sending emails to wrong addresses. Key features are a confirmation window of recipient's addresses upon sending, name and affiliation look up at mail composition and main windows, and safe auto completion.
Correct Identity
Requires Restart
Ever sent mail from the wrong email address because you forgot to select the correct identity?
Unmangle Microsoft ATP Safelinks
Users of outlook.com and o365 who have Advanced Thread Protection enabled will have all URL's in emails changed to redirect them to an Microsoft filter before opening. This is a bad idea.
This plugin will change the URL back to the original value.
Password Exporter
This add-on allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported later.
Note: This add-on won't work in Firefox 57. It may eventually if the APIs to access passwords are implemented.
ProtonMail Encryption Status
When using ProtonMail Bridge to integrate Mozilla Thunderbird withProtonMail, it's not easy to tell which emails were end-to-end (E2E) encrypted. This add-on puts an icon in the toolbar above every message to show you its encryption status.
EuropeanMX Spam Reporter
Train your EuropeanMX filter by reporting unrecognized spam back to us.
Paranoia
Requires Restart
Check if your emails arrived TLS-encrypted (and which corporations were able to read it nevertheless)
BorderColors GT
Requires Restart
How many time you sent an email from your wrong email address?
This add-ons allows you assign a different color to the compose window border for each of your email addresses. So you can immediately view from what account are you writing.
Silent Block
Customizations for Adblock Plus
This extension provides various customization options for the Adblock Plus user interface.
Confirm-Address2
Requires Restart
Confirm E-mail addresses before sending mail.
This is forked from https://github.com/Meatian/confirm-address and works with Thunderbird 68.
Classic Password Editor
Requires Restart
Adds the ability to create and edit entries in the password manager.
Check Domain
Requires Restart
This extension is to display the warning dialog when you send mail for multiple domains.
Encrypt if possible
Requires Restart
Sets message security option "encrypt message", if valid X509 certificates are found for all recipients.
PGPGeek
Quick & easy PGP encryption / decryption tool
* Save & use many public encryption keys to encrypt mail content
* Save & use many private decryption keys to decrypt mail content
Using openPGP.js
Open Source
https://github.com/pgpgeek/pgpgeek
MEGAbird
DL for Thunderbird
Requires Restart
Allows to convert large attachments to links automatically without 3rd party providers.
KeeBird
Requires Restart
Use KeePass Password Safe to manage your login credentials.
This is the replacement for the KeeFox extension for Thunderbird.
QuickPasswords
Requires Restart
Retrieve your Passwords the quick way! Never retype or display your secure passwords on screen anymore - put the password where you need it - the login form or the clipboard.
Now also includes SSO change (multi-domain pw) and Backup + Restore.
To create your own collections, you must have a Mozilla Add-ons account.
