Add-ons
Up & Coming Extensions
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MailHops
MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.
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.
gContactSync
Requires Restart
Synchronizes contacts & groups between Thunderbird and Google Contacts.
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.
Calendar Tweaks
Requires Restart
Allows several tweaks to the Thunderbird/Lightning calendar user interface including new selection styles and repeating event icons. Mimics the colors and styles found in MS Outlook.
Google-4-TbSync
This provider add-on adds Google synchronization capabilities to TbSync. Only contacts and contact groups are currently managed, using Google's People API.
Please read the "About this Add-on" section below carefully!
Birthday Calendar
Show Address Only
Requires Restart
Adds columns to display Sender/Recipients mailaddress only.
Owl for Exchange
Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).
JavaScript Debugger
Requires Restart
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.
Emoji Menu
Requires Restart
Adds the ability to easily insert emojis into your composed messages in Thunderbird.
Textmarker
Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)
keepassxc-mailTo create your own collections, you must have a Mozilla Add-ons account.
