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Provider for Google Calendar

Allows bidirectional access to Google Calendar

Rated 3 out of 5 stars (1,652)
194,531 users

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Manually sort folders

This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.

Rated 4 out of 5 stars (621)
15,260 users

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DKIM Verifier Featured

Verifies the DKIM-Signature of an e-mail.

Rated 4 out of 5 stars (46)
18,721 users

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Send Later

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (263)
106,779 users

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Remove Duplicate Messages

Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).

Rated 4 out of 5 stars (292)
99,079 users

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Emoji

Add emojis to your e-mails.

Rated 4 out of 5 stars (64)
25,503 users

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Addressbooks Synchronizer

Synchronizes selected addressbooks with other instances of thunderbird
using local files, webdav servers or imap servers

Rated 4 out of 5 stars (79)
26,631 users

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Check and Send

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

Rated 4 out of 5 stars (49)
22,374 users

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Signal Spam

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).

Rated 3 out of 5 stars (165)
16,165 users

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Confirm-Address

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (73)
22,929 users

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Automatic Dictionary

Remembers the language you use with a person or group of people, and switches the spellchecker language automatically for you next time. You do not have to do it manually any more. It remembers and switches it for you.

Rated 5 out of 5 stars (49)
3,774 users

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AutoarchiveReloaded Featured

Automatically archives old mails (Improved version of the orginal Autoarchive Add-on)

Rated 4 out of 5 stars (25)
24,294 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)
24,351 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 (179)
1,763 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)
6,365 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)
568 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)
4,003 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)
375 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)
2,043 users

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Google Keep Tab

Adds a button to open Google Keep in a new Tab

Rated 5 out of 5 stars (29)
4,450 users

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