Privacy and Security



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
17 users
Updated Nov. 13, 2022


Confirm mail address and attachments based on flexible rules.

(This project was renamed from "Flex Confirm Mail" to "FlexConfirmMail", due to a branding reason.)

Rated 4 out of 5 stars (10)
11,680 users
Updated Nov. 11, 2022


Rspamd spam filtering system score visualization.

Rated 4 out of 5 stars (6)
937 users
Updated Oct. 29, 2022

Mail Merge

Create and Save or Send Multiple Individual and Personalized Messages from a Draft

Rated 5 out of 5 stars (213)
69,842 users
Updated Oct. 29, 2022

Allow HTML Temp

Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).

Rated 4 out of 5 stars (83)
10,675 users
Updated Oct. 21, 2022

Check and Send

Check the message contents and addresses before you send the message...

Rated 4 out of 5 stars (45)
19,806 users
Updated Oct. 11, 2022


MailExtension to get password from KeePassXC.

Rated 5 out of 5 stars (5)
319 users
Updated Oct. 10, 2022

Correct Identity

Ever sent mail from the wrong email address because you forgot to select the correct identity?

Rated 4 out of 5 stars (112)
2,115 users
Updated Oct. 3, 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
6 users
Updated Sept. 23, 2022

PGP Universal

Fixes encrypted e-mail attachment names from PGP Universal servers

Not yet rated
38 users
Updated 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
33 users
Updated Sept. 18, 2022

Identity Chooser

Identity Chooser helps you to always use the correct identity when composing a new email.

Rated 4 out of 5 stars (140)
7,347 users
Updated Sept. 13, 2022

Remote Content By Folder

Decide whether to allow or block remote content in messages by comparing the names of the folders in which they are located to configured regular expressions.

Rated 4 out of 5 stars (3)
103 users
Updated Sept. 9, 2022

DKIM Verifier Featured

Verifies the DKIM-Signature of an e-mail.

Rated 4 out of 5 stars (39)
14,556 users
Updated Aug. 17, 2022

EagleCloud Extension

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

Not yet rated
2 users
Updated Aug. 9, 2022


WarnAttachment shows an additional dialog to confirm potentially dangerous attachments. Some attachments like executables etc. are completely blocked. This reduces the risk of malware especially for inexperienced users.

Rated 5 out of 5 stars (8)
2,784 users
Updated Aug. 5, 2022

FileLink provider for Send

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

Rated 5 out of 5 stars (9)
26,161 users
Updated July 24, 2022

Just Report It

Just Report It ( is an email plugin which tackles spam the right way. Report emails straight to SpamCop, the Registrar, a custom email address or any combination in between!

Rated 5 out of 5 stars (8)
606 users
Updated July 20, 2022


Simply turn on or turn off the alerts shown & sounds played when new message arrives.

Rated 4 out of 5 stars (4)
611 users
Updated July 8, 2022


MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.

Rated 4 out of 5 stars (35)
2,807 users
Updated June 30, 2022