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FiltaQuilla

Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.

Rated 4 out of 5 stars (100)
16,006 users

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FlexConfirmMail

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 (11)
24,971 users

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Mailbox Alert

Mailbox Alert allows you to specify, for each seperate mail folder, a message, sound and/or a system command that will be executed when new mail is found there. ...

Rated 4 out of 5 stars (180)
1,575 users

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Grammalecte [fr] (for Thunderbird)

French grammar checker. Included: conjugation tool, text formatter and spelling dictionaries.

Rated 4 out of 5 stars (16)
6,038 users

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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 (89)
10,707 users

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Nederlands (nl) Language Pack

Nederlands (nl) Language Pack

Not yet rated
31,605 users

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Sieve

This Extension implements the ManageSieve protocol for securely managing Sieve Script on a remote IMAP server...

Rated 4 out of 5 stars (49)
502 users

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Show All Body Parts Requires Restart

Enable the View | Message Body As | All Body Parts message display mode.

Rated 4 out of 5 stars (22)
177 users

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G-Hub Lite

Google Tabs for Thunderbird! G-Hub Lite supports Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need Google Workspace support (formerly G Suite)? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro

Rated 4 out of 5 stars (23)
3,891 users

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Thunderbook Requires Restart

Export messages (including RSS items) as e-books.

Rated 4 out of 5 stars (3)
3,177 users

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Blinking Alert Requires Restart

Adds blink feature to the new-mail alert.
You can also disable auto-hiding of the alert.

Rated 4 out of 5 stars (29)
3,555 users

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CategoryManager

Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).

Rated 5 out of 5 stars (25)
7,639 users

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CardDAV Browser

A utility to browse vCards stored on a CardDAV server.

This version is only for Thunderbird. There is a SeaMonkey version available if needed.

Rated 3 out of 5 stars (7)
391 users

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Français (fr) Language Pack

Français (fr) Language Pack

Rated 3 out of 5 stars (34)
92,213 users

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Shrunked Image Resizer

Make your photos smaller, so they don't take forever to email.

*Shrunked Image Resizer is no longer maintained.*

Rated 4 out of 5 stars (88)
13,827 users

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Edit Email Subject (EES)

This module allows you to change/edit email subjects

Rated 4 out of 5 stars (125)
8,210 users

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Xpunge

Empties the Trash and Junk folders, and compacts folders in multiple Thunderbird accounts.

Rated 5 out of 5 stars (76)
8,114 users

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Lightning Invitation Notifier | LIN

This extension is an extension to Mozilla Lightning for Thunderbird.
It shows a toast message and opens the invitations window when an invitation arrives.

Rated 4 out of 5 stars (2)
2,209 users

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ReplyWithHeader

Outlook style headers and few goodies for Thunderbird.

Rated 5 out of 5 stars (93)
11,842 users

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Header Tools Lite

Allows to modify the header and the source of messages

Rated 4 out of 5 stars (52)
2,706 users

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