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Auto-Mark Folder Read

New messages can be automatically marked as read in common folders (e.g. spam, trash, drafts, templates).

For TB up to 121, please use the most recent v1.5.* add-on release.

For TB as of 122, just use the latest add-on version (1.6 or higher).

Rated 4 out of 5 stars (11)
685 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)
418 users

Open Google Tabs

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

Not yet rated
96 users

PrioMailbox

PrioMailbox helps you prioritize your Thunderbird inbox by automatically tagging and highlighting important emails. Trainable tags organize your inbox efficiently, saving time and reducing distractions, with a simple, user-friendly interface.

Not yet rated
30 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)
350 users

SentAutoMove

Let your replies follow their original message!

Not yet rated
4 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)
304 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
12 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)
559 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)
12 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
20 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.

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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)
6 users

Bambara/Bamanakan

Bambara spell-checker / Vérificateur orthographique pour le bambara / Bamanankan fililatilennanVérificateur disponible également comme Extension de la suite Libre Office

Not yet rated
7 users