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EmotiConverter

Post your best emoticons of the easiest and fastest way.

Rated 5 out of 5 stars (33)
420 users

Conspiracy

Shows flag/country of involved Certification Authorities (CAs) for secured pages.

Rated 5 out of 5 stars (3)
418 users

Quitomzilla

Quitomzilla helps you quit smoking while you surf the web or wait for new emails, showing the cigarettes, money and time you have saved since you quit...

Rated 5 out of 5 stars (18)
417 users

Słowniczek

Adds to context menu web dictonaries: Ling.pl, Dict.pl, Diki.pl, Angool.pl, MegaSłownik, Onet.pl: Tłumacz and Synonimy.pl

Rated 5 out of 5 stars (7)
415 users

Macro Template No Restart

Macro Template is to replace mail templates with macros for date formatting.

Rated 5 out of 5 stars (1)
405 users

Display mailing list header

This extension implements RFC 2369 for Thunderbird: Special mailing list header fields in the mail are parsed, and the links are displayed in the extended header view. You can click them to simply go to the archive, request help or unsubscribe.

Rated 3 out of 5 stars (6)
402 users

JSON Inspector No Restart

Inspect JSON object from a URL or entered data.
Requires either DOM Inspector or DOM Inspector Plus! [dm] extension.

Not yet rated
400 users

bioFOX

Bioinformatics tools on Mozilla based browsers

Rated 5 out of 5 stars (20)
399 users

EDS Calendar Integration

Integrates calendars events with Gnome clock applet

IMPORTANT:
Plugin may hang on Fedora.
As a workaround uninstall evolution-ews.

Rated 4 out of 5 stars (7)
394 users

Yahoo Mail Sidebar No Restart

Yahoo Mail Sidebar brings Yahoo Mail right into your Firefox Sidebar.

Not yet rated
389 users

FireCsv No Restart

View pretty CSV directly from within Firefox and Thunderbird.

Rated 5 out of 5 stars (1)
387 users

ScrapBook AutoSave Improved

ScrapBook AutoSave Addon, with some extra features.

Rated 3 out of 5 stars (5)
387 users

MonkeyFix

Fixes up numerous SeaMonkey browser interface issues (eg. adding support for popup ALT attributes), as well as adding some handy features for developers and power users (eg. configure source viewer, work online/offline).

Rated 5 out of 5 stars (3)
385 users

CloseTab

Lightweight add-on which adds to right-click menu 3 items allowing to close current tab, open a new one and reopen closed one. Right-click anywhere on site instead of using keyboard or finding buttons.

Rated 4 out of 5 stars (3)
365 users

Add-on Preferences Button No Restart

Displays a menu that allows you to open the option/preference window for any add-on that has one.

Rated 5 out of 5 stars (2)
362 users

Element Hiding Helper for Pan No Restart

Help you create element hiding rules for Pan to fight the text ads.

Rated 5 out of 5 stars (4)
362 users

Tools > Options… for Linux No Restart

Moves Edit > Preferences to Tools > Options…

Rated 5 out of 5 stars (7)
352 users

ChatZilla zh-CN Language Pack

ChatZilla zh-CN language pack for ChatZilla 0.9.91.1

Rated 5 out of 5 stars (11)
351 users

XPCOMViewer

XPCOMViewer is tiny tool for exploring XPCOM components.

Rated 4 out of 5 stars (6)
349 users

Zippy Extension Packager No Restart

Creates XPI files of extensions you have installed.

Rated 5 out of 5 stars (13)
342 users