Privacy and Security
Enigmail Requires Restart
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
Saved Password Editor Requires Restart
Adds the ability to create and edit entries in the password manager.
Mail Merge Requires Restart
Create and Save or Send Multiple Individual and Personalized Messages from a Draft
DKIM Verifier Requires Restart
Verifies the DKIM-Signature of an e-mail.
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.
MEGAbird Requires Restart
Add MEGA support to Thunderbird's Filelink feature.
GuifiProxy Requires Restart
Simple proxy manager
- Change proxy with two clicks
- Import and export proxies lists
- Manually add, delete and edit proxies
- Automatic authentication on proxies (bypass popup with login and password)
- Proxysel replacement
Asks for the master password at startup (fixes multiple password prompt)
Check and Send Requires Restart
Check the message contents and addresses before you send the message...
Signal Spam Requires Restart
Add simple functions to report spams or phishing to Signal Spam by one click.
The add-on will also alert you if you open a fraudulent e-mail (phishing).
Confirm-Address Requires Restart
Confirm E-mail address before sending mail
Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.
Copy Folder Requires Restart
The missing Thunderbird "copy folder" feature! Copy folders or entire POP/IMAP accounts recursively to any location while maintaining folder structure.
TrayHotKey Requires Restart
Master Password+ Requires Restart
Various enhancements for build-in "master password" (MP)
-Locks master security device on demand or after specified time
-Prompts for MP on browser startup
-Suppresses all or duplicate MP prompts
-Locks up entire application or individual windows
TorBirdy Requires Restart
This extension configures Thunderbird to make connections over the Tor anonymity network.
Flex Confirm Mail Requires Restart
Confirm mail address and attachments based on flexible rules.
Allow HTML Temp Requires Restart
This Add-on allows to have HTML temporarily allowed in the currently displayed message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (if this is your default mode).
Block ads and manage proxy.
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.