Privacy and Security

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Trueblock Plus

Trueblock Plus is a fork of the Adblock Plus extension for blocking unwanted advertisements on the web. This fork provides the exact same features as Adblock plus, with the unpopular, unwanted "acceptable ads" (non-)feature turned off by default.

Rated 4 out of 5 stars (45)
2,617 users

DKIM Verifier

Verifies the DKIM-Signature of an e-mail.

Rated 5 out of 5 stars (8)
2,175 users

TorBirdy

This extension configures Thunderbird to make connections over the Tor anonymity network.

Rated 5 out of 5 stars (5)
2,083 users

Check Domain

This extension is to display the warning dialog when you send mail for multiple domains.

Rated 4 out of 5 stars (5)
1,921 users

Yet Another Remove It Permanently

Remove elements and block content on Web pages.

Rated 4 out of 5 stars (30)
1,895 users

Encrypt if possible

Sets message security option "encrypt message", if valid X509 certificates are found for all recipients.

Rated 5 out of 5 stars (14)
1,812 users

GuifiProxy

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

Rated 4 out of 5 stars (21)
1,809 users

HabuL

Reports spam to the SpamCop, the FTC, FDA, SEC, ACMA and/or Knujon.com. It also allows you to put in your own custom addresses to report spam to such as your ISP or corporate abuse address.

Rated 4 out of 5 stars (30)
1,800 users

Viral Threat Level

Adds an image to the status bar indicating the current threat level of the internet. It allows quick access to security information that you can use to help protect yourself, and links to antivirus software comparisons and security extensions.

Rated 4 out of 5 stars (22)
1,559 users

Get before Send

Get messages for the account which is bound to the identity then send the message when you click the toolbar button or the menu item. If your SMTP sever authenticates using POP(IMAP) before SMTP, the extension is useful.

Rated 5 out of 5 stars (2)
1,464 users

Too Many Recipients

Contourne la limite du nombre de destinataires/e-mail des serveurs SMTP.
Gets around the limit on the number of recipients/e-mail of SMTP servers.
Evita la limitación de número de destinatarios/e-mail del servidor SMTP.

Rated 3 out of 5 stars (13)
1,458 users

Close Proxy Authentication

Provides transparent proxy authentication on your enterprise network.
Close authentication dialog if login on proxy failed.

Rated 5 out of 5 stars (1)
1,380 users

Fingerfox (SE)

Use MS Fingerprint Reader with Firefox and Thunderbird...

Rated 4 out of 5 stars (12)
1,347 users

Batch Copy

Batch Copy creates a local copy of your IMAP account, copies all messages and maintains folder structure. Batch Copy can run incrementally to copy only new messages.

Rated 4 out of 5 stars (7)
1,336 users

Show Password On Input

Gives an option to show the master password on input

Rated 4 out of 5 stars (11)
1,239 users

Sender Verification Anti-Phishing Extension

Protects you from phishing attacks by verifying the From: address domain name of emails as you read them. Sender Policy Framework (SPF) and DNS-based reputation lists are used.

Rated 4 out of 5 stars (20)
1,218 users

DL for Thunderbird

Allows to convert large attachments to links automatically without 3rd party providers.

Rated 5 out of 5 stars (2)
1,128 users

Unsubscribe from Mailing List

Allows recipients to cancel their newsletter subscriptions in the thunderbird interface.

Rated 4 out of 5 stars (13)
1,092 users

Key Manager

KeyManager Tool: Firefox Add-on for Key Generation, Certificate Enrollment, CRL Signing, and Identity and Authority Delegation

Rated 3 out of 5 stars (20)
1,089 users

Blend In

Blends OS-related values in User-Agent HTTP request header & a number of JS properties, so that Firefox (Thunderbird) appears to sites visited as running on the OS used the most in the world. Since 18.0t17.0.2 Windows is blended in by default too.

Rated 4 out of 5 stars (6)
1,005 users