Add-ons
Folders and Filters
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CodeSnap - Generate Code Images
Turn code on any webpage into beautiful images. Select, right-click, and customize in seconds.
Differential Folder Copy
Copies only messages that do not already exist in the destination folder, in controlled batches, between Thunderbird folders.
Mail Filter Alert
Monitors and filters incoming and unread emails based on user-defined keywords, displaying matches in a beautiful centralized dashboard.
NLS Mail Manager
Manage incoming Thunderbird mail locally with automatic rules, folder routing, spam word checks, attachment extension checks and Inbox scanning.
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.
Screenshot - Instant Screenshot Saver
Capture screenshots instantly with one click
Select Similar
Select all emails in the current folder matching criteria from a single selected email.
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.
VidStamp - Youtube Upload Date Viewer
See the exact YouTube upload date on any video or Short. Free, private, no sign-up. Toggle on/off anytime.
Safe Trash Cleaner
Empties trash, junk and selected folders of selected Thunderbird accounts after confirmation.
Favorite Trash Emptier
Automatically empty trash in Favorite folders by pressing one button (instead of right-click Empty Trash on each folder). Steps:
1. Mark all relevant trash folders as Favorite Folder (right-click folder).
2. Click button "Empty Favorite Trash."
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.
NestorAI
NestorAI is an AI assistant for Thunderbird that helps analyze email, prepare reply drafts, organize messages, and generate recaps, while also supporting local AI so processing can stay on the user's machine.
mboxSleuth
Forensic email analysis toolkit for mbox files.
24 modules: social graph, entity extraction, keyword search, evidence tagging, noise suppression, header analysis, attachment hashing, and more.
All processing is local.
MAC Vendor Lookup
Quickly identify the manufacturer of any device by its MAC address using a simple context menu option.
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.
Favorite Folders+
Quickly access your favorite Thunderbird folders from a dedicated sidebar. Organize, reorder, and customize them with icons and colors for a faster email workflow. Supports multiple accounts.
New Mail Notifier
Shows notifications when new mail arrives in Thunderbird 128+.
Retention Policy
Automatically delete or archive old messages per folder. Right-click any folder to set retention days and action. Runs daily or on demand with system notifications.
Attachment Grabber: Bulk save
Attachment Grabber extracts and saves attachments from selected emails. Configure filename patterns using variables to organize saved files automatically. Quickly collect attachments from multiple messages without opening each email.
To create your own collections, you must have a Mozilla Add-ons account.
