Privacy and Security
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.
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
Mail Merge Requires Restart Featured
Mass Mail and Personal Mail
Saved Password Editor Requires Restart
Adds the ability to create and edit entries in the password manager.
Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.
Confirm-Address Requires Restart
Confirm E-mail address before sending mail
Asks for the master password at startup (fixes multiple password prompt)
Flex Confirm Mail Requires Restart
Confirm mail address and attachments based on flexible rules.
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
Check and Send Requires Restart
Check the message contents and addresses before you send the message...
Auto Address Cleaner Requires Restart
Removes comment, display name automatically from addresses before sending mail.
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.
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).
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).
Identity Chooser Requires Restart
Identity Chooser helps you to always use the correct identity when composing a new email.
Extended Cookie Manager - Keep only wanted cookies.
Correct Identity Requires Restart
Ever sent mail from the wrong email address because you forgot to select the correct identity in the compose window?
DKIM Verifier Requires Restart
Verifies the DKIM-Signature of an e-mail.
This extension provides various customization options for the Adblock Plus user interface.
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.