Privacy and Security


uBlock Origin

Finally, an efficient blocker. Easy on CPU and memory. uBlock Origin (uBO) is a CPU and memory-efficient wide-spectrum content blocker that blocks ads, trackers, coin miners, popups, annoying anti-blockers, etc. in your feeds.

Rated 4 out of 5 stars (2)
4,181 users
Added April 28, 2023

Just Verify It

Just Verify It is a Thunderbird add-on that automates the scanning of email attachments with VirusTotal for malware. With over 50 antivirus engines, it provides reliable and quick results, ensuring the safety of your digital assets.

Rated 5 out of 5 stars (1)
62 users
Added April 21, 2023

New Bing Anywhere

New Bing isn't just for Edge anymore. Anywhere you want

Rated 3 out of 5 stars (1)
27 users
Added April 12, 2023


turns thunderbird into firefox (powered by mojeek)

Rated 3 out of 5 stars (1)
0 users
Added March 7, 2023

Cypherdog Encryption

Encrypt any file, any text, and share via any medium, any time

Not yet rated
24 users
Added Feb. 28, 2023


Modern encryption in Thunderbird - powered by Rust, rage and WebAssembly

Rated 5 out of 5 stars (1)
7 users
Added Feb. 14, 2023


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

Not yet rated
58 users
Added Oct. 19, 2022

PGP Universal

Fixes encrypted e-mail attachment names from PGP Universal servers

Not yet rated
86 users
Added Sept. 22, 2022


SmartProxy is a smart automatic proxy switcher that will automatically enable/disable proxy for the sites you visit, based on customizable rules.

Not yet rated
110 users
Added Sept. 18, 2022

EagleCloud Extension

Works along with EagleCloud Information Security product to secure sensitive information based on company policy.

Not yet rated
3 users
Added Aug. 9, 2022

TUD-CERT Phishing Report

Adds a phishing report button to the toolbar to enable members of Technische Universität Dresden to report suspicious e-mails to TUD-CERT with just a few clicks. If desired, an optional comment can be entered upon each report.

Not yet rated
136 users
Added May 5, 2022


Update 2023: This addon will be replaced by "arcus".

Modern encryption in Thunderbird

** Currently in testing phase **
What you can do:
1. Set your secret key and automatically decrypt emails
2. Generate a new key pair
3. Encrypt plain text

Not yet rated
6 users
Added April 11, 2022

Zivver for Thunderbird

This extension automatically detects Zivver messages and decrypts them on-the-fly using the Zivver API. Messages are decrypted only when actively displayed by the user and are never stored locally.

Not yet rated
8 users
Added April 4, 2022


MailExtension to get password from KeePassXC.

Rated 5 out of 5 stars (6)
420 users
Added March 24, 2022


AddOn for sending regimail with Thunderbird on Windows, MacOS and Linux.

In order to use this AddOn, you need to install the regify client on your system and configure it with a valid regify account.

Not yet rated
8 users
Added March 21, 2022

MetaClean for Thunderbird

Removes metadata and hidden data in email attachments preventing the leakage of confidential information that occurs in this type of communication and avoiding possible economic and reputational damages derived from the malicious use of metadata.

Not yet rated
314 users
Added Dec. 11, 2021


When you reply to a mail sent to your personalized address (postfix/qmail/gmail extensions) such as [email protected], "From:" is replaced by your personalized address rather than your simple address.

Rated 5 out of 5 stars (3)
138 users
Added Nov. 23, 2021

FileLink provider for Send

Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).

Rated 5 out of 5 stars (13)
32,011 users
Added July 26, 2021

OpenPGP Alias Updater

Updates the local OpenPGP Alias file from a server to simplify encryption for mailing lists, or email aliases in an organizational environment.

Please make sure config parameter "mail.openpgp.alias_rules_file" is set to "openpgp_alias.json".

Rated 5 out of 5 stars (1)
758 users
Added May 19, 2021

SPAM Check for OCN

- SPAM Header Checker for OCN(Japanese Internet Provider)
- This plugin looks at the header of the mail and assigns a "junk mail" mark.
- Only if the header (X-CON-SPAM-CHECK) of the mail is set to 100%, it will be marked as "spam".

Rated 1 out of 5 stars (1)
60 users
Added March 7, 2021