Add-ons
Folders and Filters
Sort by:
CazAdjuntos
Automatically download and organize email attachments by sender, year and month. Filter by file type, sender and subject.
Move messages or yourself
Move messages or jump to folder with a keystroke.
SpamTitan for Thunderbird
Report spam/ham and manage allow/block lists on your SpamTitan Gateway directly from Thunderbird.
Auto Mark As Read
Automatically mark incoming messages as read if they are in one of selected folders.
An attempt to revive & enhance 'Mark Junk Read' by Alex Cabal
PostScriptum
Files your sent message and the replied-to or forwarded message right after sending — across accounts and servers, into folders of your choice, with tags. Everything that belongs together in one place.
JayBeeMailManager
Organize Thunderbird mail with flexible rules, previews, schedules, logs and undoable automation.
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.
Quick Steps
Thunderbird add-on to create one-click Quick Steps that perform multiple email actions in sequence, such as moving, copying, deleting, and archiving messages.
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.
Custom Subject Column
Add a column to the message list that replaces the subject with a regular expression
Auth Results Filter
Scores incoming mail using Authentication-Results headers from your trusted mail servers. Suspicious messages go to a review folder. All processing stays local — nothing is sent to external services.
Starred Sidebar by KoaSOFT
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.
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.
Folder Filter Scheduler
Run message-filter rules automatically on any folder, not just the Inbox. Match by sender, subject, reply-to and more, then move, copy, delete, or mark messages on a schedule across multiple accounts. A modern successor to Auto Filter Timer.
quickFilters
Quickly generate mail filters on the fly, by dragging and dropping mails and analyzing their attributes. Create a filter in less than 10 seconds, it's as easy as: drag, click, click.
By popular demand, supports SORTING filters alphabetically.
Safe Trash Cleaner
Empties trash, junk and selected folders of selected Thunderbird accounts after confirmation.
AI Spam Detector
Detects spam and scam emails using a local LLM hosted by LM Studio and marks them as junk mails.
E-mails are checked when they are downloaded by Thunderbird. You need to have access to running LM Studio with the proper LLM loaded to use the filter.
SoundMail
Thunderbird add-on: play different new-mail sounds using rules (sender, domain, subject, body, regex), per-account & default sounds, drag-to-reorder priority, JSON import/export, and optional light/dark theme + UI language for the settings page.
To create your own collections, you must have a Mozilla Add-ons account.
