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Advanced Composer

Creates message templates with variable support, quote header in Ms Outlook style, signatures, custom attachment info for cloud files, and more.

Rated 4 out of 5 stars (9)
471 users

Old (classic) Icons

This replaces the new monochrome icons with the old/classic colorful icons. Uses the code from Phoenity Icons and the graphics from older Thunderbird versions.

Rated 5 out of 5 stars (30)
2,709 users

MyPhoneExplorer

This Addon is needed to sync your Android based smartphone with Thunderbird with the Software "MyPhoneExplorer". You can get MyPhoneExplorer from: https://www.fjsoft.at

Rated 4 out of 5 stars (17)
10,010 users

Weatherlicious

A dynamic theme based on weather data from OpenWeatherMap.

Rated 4 out of 5 stars (9)
402 users

Microsoft To Do - Quick Access

Quick Access to Microsoft To Do (Live) in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Rated 5 out of 5 stars (1)
445 users

Open Google Tabs

Open up Google Calendar, Notes, and Microsoft Outlook in a new tab.

Not yet rated
104 users

ThunderSuite - Customize your Quick Access Sidebar

This extension allows user editing of the spaces sidebar.
Create custom spaces from the extension options, to turn the new toolbar introduced with Supernova into your personal quick access toolbox.

Rated 5 out of 5 stars (8)
367 users

Gemini - Quick Access

Quick Access to Google Gemini AI (formerly Bard) in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Rated 5 out of 5 stars (1)
317 users

GetMyInvoices

Save your attached PDF invoices or archive and store complete invoice e-mails directly to your GetMyInvoices account from Thunderbird

Not yet rated
13 users

UnInbox - Quick Access

Quick Access to UnInbox in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Not yet rated
8 users

CollectAddresses

Collect all sender/recipient/... addresses and store in an addressbook

Rated 4 out of 5 stars (4)
560 users

Two Dynamic Birds

An extension of the "Two Little Birds" and "Dracula" themes that includes a toggle button to turn on dark mode.

The position of the light/dark toggle button can be customised to avoid it covering the cute birds!

Not yet rated
165 users

BestReply

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)
16 users

Pushover Notifier

Send a Pushover notification when a new email arrives.

Plugin requires a Pushover account.

This plugin is not affiliated with or endorsed by Pushover. It was created independently. Use at your own risk.

Not yet rated
23 users

Spacebar Clicker

With Spacebar Clicker, gamers can now test their spacebar speed within the browser. Every gamer can install the extension and practice to increase how many times they press the spacebar.

Not yet rated
0 users

Dictionnaire Moore

Le dictionnaire Moore / Moor Gom-Biis No-Tũur Gʋlsg Sebre : "Burkina Faso" Edition mars 2015 Cemie.

Not yet rated
0 users

Belarusian spellchecking dictionary (Taraškievica orthography) Requires Restart

Belarusian spellchecking dictionary (Taraškievica orthography)
Беларускі слоўнік праверкі артаграфіі (клясычны правапіс)

Rated 2 out of 5 stars (2)
0 users

GaelSpell Seanchló

Seo é an gnáthlitreoir GaelSpell, ach leis na consain bhuailte ḃ, ċ, ḋ, ḟ, ġ, ṁ, ṗ, ṡ, ṫ in ionad bh, ch, srl. An-oiriúnach do Twitter!

Rated 5 out of 5 stars (1)
0 users

Church Slavonic Spelling Dictionary

The spelling dictionary is based on the Hunspell spelling dictionary for Church Slavonic (Church Slavic). Numerals only from 1 to 9999 are recognized.

Not yet rated
1 user

Kashubian Spell Checker (Poland)

This Spell Checker may help writers verify correctness of their Kashubian spelling. It works under Firefox, Thunderbird, and SeaMonkey.

Nen werifikator kaszëbsczégò pisënkù mòże ùżëwac pòd Firefoksã, Thunderbird, ë SeaMonkey.

Rated 5 out of 5 stars (2)
7 users