Thunderbird extensions

SaaY List by SaaY , last updated Jan 6, 2026

LanguageTool
Like
https://addons.thunderbird.net/en-US/thunderbird/addon/grammar-and-spell-checker/
Cost / License
Freemium
Open Source
Application types
Grammar Checker
AI Writing Tool
Platforms
Mac
Windows
Linux
Online
iPhone
iPad
Microsoft Edge
ONLYOFFICE
Google Chrome
Microsoft Outlook
Safari
Visual Studio Code
Microsoft Word
Eclipse
TinyMCE
Google Docs
Thunderbird
Vim
Sublime Text
GNU Emacs
Opera
Gmail
LibreOffice
Apache OpenOffice
Mozilla Firefox
LibreOffice - Writer
Cloudron
+4
Proton Calendar
Like
https://addons.thunderbird.net/en-US/thunderbird/addon/proton-calendar-toolbar-button/
Cost / License
Freemium
Proprietary
Application type
Calendar App
Platforms
Online
Android
iPhone
Android Tablet
Tor
iPad
+2
Proton Mail
Like
https://addons.thunderbird.net/en-US/thunderbird/addon/proton-mail-toolbar-button/
Cost / License
Freemium
Open Source
Application types
WebMail Provider
Email Client
Platforms
Mac
Windows
Linux
Online
Android
iPhone
iPad
Tor
Flathub
Snapcraft
+9
WhatsApp
Like
https://addons.thunderbird.net/en-US/thunderbird/addon/whatsapp-quick-access/
Cost / License
Free
Proprietary
Application types
Instant Messenger
Video Calling App
Platforms
Mac
Windows
Online
Android
iPhone
iPad
Apple Watch
Android Auto
Android Wear
Apple Car Play
+6

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