Up & Coming Extensions
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Identity Chooser
Identity Chooser helps you to always use the correct identity when composing a new email.
Nostalgy++/ Manage, search and archive emails
Shortcuts to move/copy/archive messages, with folder name completion.
Rules for moving messages to folders.
Automatic rules by statistical observation/ by folder of conversation/thread.
Search dialog in a tab, with message display /folder tree.
Filter on Folder Button
new in version 1.5.1:
code optimised for Thunderbird version >= 115
new in version 1.5:
code changed to popup menu
functions:
new menu button with filter functions, with hotkeys, theme support, more languages
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. ...
Add Signature Requires Restart
Simply add your signature manually (right mouse click) to your emails
InsertSignature
Insert signature helps you to insert usually used text by your customization.
Quote Colors & Collapse
Configure text and background colors of quotes in mail and news messages. From up addon version 3 (Thunderbird 91) you can collapse quotes.
GCalTab
GCalTab is a Thunderbird add-on that opens Google Calendar website in a Thunderbird tab. It features a beautiful dark mode thanks to the DarkReader algorithm.
Correct Identity
Ever sent mail from the wrong email address because you forgot to select the correct identity?
Blinking Alert Requires Restart
Adds blink feature to the new-mail alert.
You can also disable auto-hiding of the alert.
Markdown Here Revival
A revival of the popular Markdown-Here addon for Thunderbird 78 and beyond.
Markdown Here Revival is a Thunderbird extension that lets you write emails in Markdown and render them as HTML before sending.
FileLink Provider for Dropbox
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.
Grammar and Spell Checker — LanguageTool
Check your emails for spelling and grammar issues
Duplicate Contacts Manager Requires Restart
This Thunderbird add-on searches address book(s) for pairs of matching contact entries.
It can automatically delete entries that have equivalent or less information than the other one.
Any remaining matches are presented for manual treatment.
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.)
To create your own collections, you must have a Mozilla Add-ons account.