Newest Extensions


Lightning Nightly Updater (Unofficial)

Quickly get to the latest nightly build of Lightning relevant to the version of Thunderbird and the OS you're on.

Rated 4 out of 5 stars (39)
11,346 users
Added March 8, 2007

Compact Menu 2

Add a compact menu button to the navigation toolbar, and hide the menu bar.

Rated 4 out of 5 stars (348)
8,273 users
Added February 20, 2007

XML Digital Signature Tool

XML Digital Signature Tool is a Firefox add-on for processing Digital Signature in XML documents
(Please read the installation instruction in the "Developer Comments" section before downloading)

Rated 4 out of 5 stars (3)
293 users
Added February 13, 2007

X-notifier (for Gmail,Hotmail,Yahoo,AOL ...)

Notifier for gmail, yahoo, hotmail, aol and more webmails.
X-notifier(aka WebMail Notifier) checks your webmail accounts and notifies the number of unread emails...
Supports : gmail, yahoo, hotmail, POP3/IMAP, facebook, twitter and more

Rated 4 out of 5 stars (1,627)
105,603 users
Added February 9, 2007

Dog Ears

Mark important parts of a webpage to easily relocate them.

Rated 4 out of 5 stars (27)
171 users
Added February 7, 2007

Key Manager

KeyManager Tool: Firefox Add-on for Key Generation, Certificate Enrollment, CRL Signing, and Identity and Authority Delegation

Rated 3 out of 5 stars (20)
1,130 users
Added February 6, 2007


LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).

Rated 4 out of 5 stars (145)
197,945 users
Added January 31, 2007

Font Finder

FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

Rated 4 out of 5 stars (66)
33,327 users
Added January 29, 2007

Element Hiding Helper for Adblock Plus No Restart

Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.

Rated 5 out of 5 stars (449)
760,499 users
Added January 22, 2007

Tab Counter No Restart

A simple extension that counts the number of open tabs per window and displays the count in the toolbar...

Rated 4 out of 5 stars (103)
16,365 users
Added January 19, 2007


Move SeaMonkey's throbber from the Toolbar to the Menubar.

Not yet rated
2 users
Added January 15, 2007


Improves tab identification by providing a small colored icon for any site which doesn't have its own 'site icon'.
★ 'favicon' now also shown in history and bookmarks ★

Rated 4 out of 5 stars (38)
1,694 users
Added January 11, 2007

Colored Diffs

Color diffs sent by SVN/CVS/GIT/Mercurial...

Rated 4 out of 5 stars (20)
820 users
Added January 9, 2007


Shows whether the application is running with admin privileges, using an icon in the status bar; useful if logged in as an administrator and you use privilege limitation tools such as DropMyRights, RunAs or Windows User Account Control.

Rated 5 out of 5 stars (10)
779 users
Added January 8, 2007

World Weather+

Displays local weather information from around the world...

Rated 4 out of 5 stars (36)
639 users
Added December 21, 2006

It's All Text!

Edit textareas using an external editor, because it's all text!

Right click on a textarea, select "It's All Text!" and edit the text in the editor of your choice.

Alternatively, click on the edit buttons added for your convenience. Right click on ...

Rated 4 out of 5 stars (188)
12,313 users
Added December 18, 2006

Filter Uploader for Adblock Plus

DOES NOT BLOCK ADS! Don't install this add-on if you don't know what 'uploading' means!

This add-on Uploads the filters from your Adblock Plus installation to a FTP, HTTP, HTTPS server...

Rated 3 out of 5 stars (45)
22,275 users
Added December 8, 2006

PhishTank SiteChecker Classic Mod

PhishTank SiteChecker is an advanced Phishing Protection extension that uses data from to determine if a site is a phishing site or not. If it is, it will block the site and protect you from the site

Rated 2 out of 5 stars (2)
1 user
Added December 2, 2006


Tabinta lets you insert tab characters in multi-line text input fields. The name itself is a shorthand for "Tab in Textarea"...

Rated 4 out of 5 stars (21)
852 users
Added November 25, 2006

Relaxed the HTML Validator

"Relaxed" is a HTML validator which validates HTML documents using it's own schema definitions written in Relax NG with embedded Schematron patterns.

Rated 2 out of 5 stars (4)
53 users
Added November 23, 2006