Recently Updated Extensions
Send Later Requires Restart
True "Send Later" functionality to schedule the time for sending an email.
Open With Requires Restart
Quickly test out your web pages in Chrome, Edge, Safari, or Opera. Open With opens the current page in your other browsers with just two clicks.
Open With as a WebExtension is being developed. See the development channel to try it.
Auto Resize Image Requires Restart
Resizer for inline and attachment images (JPEG, PNG, BMP and GIF image formats).
All platforms are supported (Windows, Linux and Macintosh).
Mail Redirect Requires Restart Featured
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
ReFwdFormatter Requires Restart
Remove the ">" prefix from quote when you make a reply.
[Source code] https://github.com/isshiki/ReFwdFormatter
Remove Duplicate Messages (Alternate) Requires Restart
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
pass-manager Requires Restart
Replace integrated password managers storage with zx2c4's pass (www.passwordstore.org)
SMTP Switch Reborn Requires Restart
Auto Compress File Requires Restart
Compressor for attachment files. All platforms are supported (Windows, Linux and Macintosh).
Addressbooks Synchronizer Requires Restart
Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers
Dcurrency Requires Restart
Currency exchange rates in the status bar (data from Yahoo!Finance or Google on option).
Display currency graphs.
Show InOut Requires Restart
Adds two columns to the list of mails. One shows an indicator wether a mail is incoming or outgoing, the other shows the sender or the recipient of the mail respectively...
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.
Thunderbook Requires Restart
Export messages (including RSS items) as e-books.
WarnAttachment Requires Restart
WarnAttachment shows an additional dialog to confirm potentially dangerous attachments. Some attachments like executables etc. are completely blocked. This reduces the risk of malware especially for inexperienced users.
Stop Ignoring Reply:To Requires Restart
Default "Reply" functionality pays attention to "Reply-To" in original email
'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.
Beta builds on versions page!
The 'NoiaButtons' add-on offers cartoonish toolbar button icons (known from Noia themes) for default theme and lightweight themes. Further more lite silver and dark versions of Noia themes are included.
FromToGMAP Requires Restart
Calculation of the distance and delay between reference address and highlighted address with the Google Map engine. Right click with mouse, select 'Distance with FromToGMAP' and the calculation of distance and delay appear in a popup
Decide whether to allow or block remote content in messages by comparing the names of the folders in which they are located to configured regular expressions.