Message Composition



Adds easy custom emojis to Thunderbird.

NOTE: you need to add the emojis yourself in the extension settings

Not yet rated
11 users
Added July 6, 2024


BestReply is an add-on that aims to improve users’ experience by providing quick services to the user such as summarization of emails, response generations, as well as a smart chat with our AI model based on the email they are reading.

Rated 3 out of 5 stars (1)
5 users
Added June 28, 2024

Identity Selector

Always select the right identity with Identity Selector!

Rated 4 out of 5 stars (2)
7 users
Added June 13, 2024

Reply All Button

Add a "Reply All" button which never behaves like "Reply List". Intended to replace the Smart Reply button to avoid accidentally performing Reply List behavior.

Rated 5 out of 5 stars (1)
9 users
Added June 1, 2024

Lex-ON Conecta

Conecta tu correo con Lex-ON.

Not yet rated
1 user
Added May 23, 2024


Supplementary compose menus to reply to a message by including its original attachments and to create a new email to the recipients of an existing message.

Not yet rated
17 users
Added May 11, 2024

AI Grammar

Helps you write emails with the Llama3 LLM (offline). Corrects grammar mistakes in your draft email.

Rated 5 out of 5 stars (1)
122 users
Added April 28, 2024

ThunderAI (ChatGPT in your emails!)

ThunderAI uses the capabilities of ChatGPT to enhance email management.
It enables users to analyze, write, correct, and optimize their emails.
There is no need for an API key and is possibile to use this extension even with a free account!

Rated 5 out of 5 stars (8)
886 users
Added April 5, 2024

One-Click Forward

Forward emails directly through a dropdown of predefined recipients.

Configure recipients in settings. Use the message toolbar button "Quick Forward" to open a dropdown with your recipients and forward directly, or hold Shift to edit first.

Rated 5 out of 5 stars (1)
110 users
Added Nov. 8, 2023

Paste code

Thunderbird addon creating a context menu option that pastes code beautifully in HTML messages

Not yet rated
96 users
Added Oct. 4, 2023

Freecosys - FileLink provider

Turns your huge files into short links

Not yet rated
207 users
Added Sept. 21, 2023

Send Later Button

The Send Later Button extension enhances Thunderbird by enabling 'Send Later' even in online mode. It supports many Languages, ensuring a seamless user experience.


Rated 1 out of 5 stars (1)
867 users
Added Aug. 13, 2023

HTML Source Editor

Allows to edit the source of the currently composed message. A simple alternative to ThunderHTMLedit.

Rated 5 out of 5 stars (12)
2,701 users
Added July 31, 2023


Displays the contact photo/image/picture of the sender/recipients while reading/composing message.
Images are taken from local image files or Address Book (see addon's options page).

Rated 4 out of 5 stars (2)
39 users
Added July 31, 2023


Encaminhe múltiplos e-mails de uma só vez.

Not yet rated
23 users
Added July 10, 2023

S3 FileLink Provider

Uploads your large attachments to S3

Rated 1 out of 5 stars (1)
563 users
Added July 2, 2023


Rewrite or generate text based on promps using OpenAI's API.

Configure on settings page (make sure to save) and start to use when writing your emails!

You must have a payment method on record with OpenAI and an API key. OpenAI charge for use.

Rated 5 out of 5 stars (10)
338 users
Added May 11, 2023

Cypherdog Encryption

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

Not yet rated
39 users
Added Feb. 28, 2023


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

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

FDK KIM Plugin

Dieses Plugin setzt automatisch die KIM-Header und den Betreff passend zu ihrem Anhang.

Anhängen werden analysiert und falls genau eine valide p7s Datei erkannt wird, werden die entsprechenden Daten automatisch gesetzt.

Not yet rated
58 users
Added Jan. 31, 2023