Add-ons
Folders and Filters
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Copy My Email
Copy my email address to clipboard
Adds right-click menu item on mailbox or any folder belonging to mailbox. Copies selected mailbox address to clipboard.
JevIt: AI mail triage
Jev is TypeSafe’s AI model for fast, structured decisions. It evaluates text and returns answers software can act on, making it useful for deciding whether an email is spam, an invoice or something urgent. It’s remarkably cheap:
One-Click Sender Search
Filter emails by sender with one click to quickly find past conversations.
Emptying
Safely delete Thunderbird messages by account, folder, and date range. Preview results, protect or delete matching messages by subject and sender, and schedule daily retention cleanup with permanent IMAP deletion.
Migrate Messages Between Accounts
Provides ability to synchronize messages between two accounts (POP3/IMAP => IMAP) automatically for account migration.
Shared Mailbox Sent Cleanup
Moves the duplicate copies that Exchange Online stores in your personal Sent folder when you send from a shared mailbox via SMTP to Trash. Server-side, so the copies also disappear from Sent Items in Outlook and OWA.
People Panel
Zeigt beim Lesen einer E-Mail ein Kontaktprofil des Absenders: gemeinsame E-Mail-Historie, Statistiken und ausgetauschte Anhaenge.
Domain Mail Organizer
Organize customer email into account-local folders using exact domain rules, automatic filing, large-Inbox processing, and contact capture.
Move and Jump
Type-ahead search to move emails to a folder, or jump to one. Remembers the folders you use most.
Please see https://github.com/bovender/move-and-jump for a detailed explanation.
Duplicate Email Remover
Finds and removes duplicate emails across your Thunderbird folders using the Message-ID header for reliable matching, with a subject/sender/date/size fallback for the rare message that lacks one. Allows individual folder scan inclusion/exclusion.
CleanMail
Email inbox cleanup: sender statistics, bulk deletion, newsletter unsubscribing, and automatic cleanup rules.
Starred Sidebar by Koastal Kollective
Adds a toolbar button that opens a panel listing every starred (flagged) email from all your accounts and folders in one place. Click any message to open it, or click its star to unstar—so nothing important slips away. Fast, private, all local.
JayBeeMailManager
Organize Thunderbird mail with flexible rules, previews, schedules, logs and undoable automation.
Folder Filter Scheduler
Run message-filter rules automatically on any folder, not just the Inbox. Match by sender, subject, age or address book, then tag, move, copy, mark or delete. Runs on a timer and on new mail, across accounts. Successor to Auto Filter Timer.
CodeSnap - Generate Code Images
Turn code on any webpage into beautiful images. Select, right-click, and customize in seconds.
SpamTitan for Thunderbird
Report spam/ham and manage allow/block lists on your SpamTitan Gateway directly from Thunderbird.
Snooze – Remind Me Later
Snooze emails like in Gmail/Outlook: right-click a message, pick a time, and it leaves your Inbox and returns automatically later. 9 languages, no tracking, all local.
Auth Results Filter
Cuts through spam and phishing noise: suspicious mail is set aside in a Review folder, notifications can be limited to mail that passes your chosen trust threshold, and every decision is explained. All processing stays on your device.
Snooze Ninja
Snooze emails like Gmail — but private and on your terms. Pick a wake time, the message moves to a Snoozed folder, and Thunderbird drops it back into your inbox when you need it. Your mail never leaves your machine. No telemetry, no cloud middleman.
Differential Folder Copy
Copies only messages that do not already exist in the destination folder, in controlled batches, between Thunderbird folders.
To create your own collections, you must have a Mozilla Add-ons account.
