Add-ons
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Provider for Google Calendar
Requires Restart
Allows bidirectional access to Google Calendar
Reply to Multiple Messages
Requires Restart
Add menu commands for replying to multiple messages at the same time.
Copy Sent to Current
Requires Restart
Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.
Owl for Exchange
Allows you to use your Exchange email accounts that use Outlook Web Access (OWA) with Thunderbird
ReminderFox
ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.
Send Later
Requires Restart
True "Send Later" functionality to schedule the time for sending an email.
Show Outlook Appointments (vcal / ics)
Requires Restart
An extension to show embedded Outlook calendar (vcal / ics) parts.
Thunderbird doesn't show calendar parts from Outlook appointment emails. This addon adds a button to download the embedded appointment as ICS to import it into another calendar.
ThunderLink
Clickable, durable links to specific messages inside Thunderbird.
CardBook
Requires Restart
Featured
A new Thunderbird address book based on the CardDAV and vCard standards.
Twitter: @CardBookAddon
EnForward
Requires Restart
Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).
This function can be invoked by "Forward to Evernote" in the context menu.
Tag Toolbar
SMTP Switch Reborn
Allow HTML Temp
Requires Restart
This Add-on allows to have HTML temporarily allowed in the currently displayed message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (if this is your default mode).
Quicktext
Requires Restart
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
Resubmit
Requires Restart
(Re)submit multiple messages to a predefined recipient(s)
Mail Redirect
Featured
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
Spanish (Mexico) Dictionary
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.
Thunderbird Conversations
This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.
quickFilters
Requires Restart
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.
To create your own collections, you must have a Mozilla Add-ons account.
