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Clip to OneNote Requires Restart
Clip to OneNote is a free add-on which helps you to send text, pictures and other data to Microsoft Office OneNote with a single click.
Mnenhy Requires Restart
The primary goal of the Mnenhy project is to make some enhancements to SeaMonkey MailNews/Thunderbird, since there're still plenty of comfort functions missing if compared to Netscape 4.x and other mail and news clients.
AastraClickToCall Requires Restart
Converts telephone numbers into clickable links for use with Aastra IP Phones
BlunderDelay Requires Restart
Thunderbird Extension: AutoSend Unsent Messages. Flushes entire outbox at regular intervals.
Birthday Reminder Requires Restart
Birthday Reminder reminds of upcoming birthdays for all contacts in Thunderbird's address book. Supports Lightning, reminders and even Google Calendar :-)
Dcurrency Requires Restart
Currency exchange rates in the status bar (data from Yahoo!Finance or Google on option).
Display currency graphs.
SmtpSelect Requires Restart
A toolbar button providing easy access to choosing the default SMTP server in Thunderbird.
Keyword Highlight Requires Restart
Keywordhighlight changes color/size/weight of your favorite keywords...
Character Palette Requires Restart
Firefox toolbar for selecting strange characters that are not on my keyboard.
Select Address Book Text Requires Restart
Copy and paste a name, phone number, address or other text from your Thunderbird address book quickly, with just a single menu click.
THUNDER!Box Requires Restart
Thunder!Box allows transferring contacts from your Thunderbird-Addressbook to the phonebook of a connected AVM FRITZ!Box FON router and back. You may also use your addressbook to initiate calls.
Dictionary Switcher for Thunderbird Requires Restart
Toggles spelling dictionaries automatically or manually and displays the currently selected one in the status bar.
Now merged with Dictionary Switcher v1.3 for Firefox/SeaMonkey
View Your Certificates Email Address
Adds a column for displaying the certificates Email address to the "Your Certificates" tab of the Certificate Manager
WebApp Tabs
Allows you to configure a set of WebApps to open easily as tabs within Thunderbird trying to give them all the functionality that you'd find in Firefox.
To create your own collections, you must have a Mozilla Add-ons account.