Most Popular Extensions
Post your best emoticons of the easiest and fastest way.
Shows flag/country of involved Certification Authorities (CAs) for secured pages.
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...
Adds to context menu web dictonaries: Ling.pl, Dict.pl, Diki.pl, Angool.pl, MegaSłownik, Onet.pl: Tłumacz and Synonimy.pl
Macro Template No Restart
Macro Template is to replace mail templates with macros for date formatting.
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.
JSON Inspector No Restart
Inspect JSON object from a URL or entered data.
Requires either DOM Inspector or DOM Inspector Plus! [dm] extension.
Bioinformatics tools on Mozilla based browsers
Integrates calendars events with Gnome clock applet
Plugin may hang on Fedora.
As a workaround uninstall evolution-ews.
Yahoo Mail Sidebar No Restart
Yahoo Mail Sidebar brings Yahoo Mail right into your Firefox Sidebar.
FireCsv No Restart
View pretty CSV directly from within Firefox and Thunderbird.
ScrapBook AutoSave Addon, with some extra features.
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).
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.
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.
Element Hiding Helper for Pan No Restart
Help you create element hiding rules for Pan to fight the text ads.
Tools > Options… for Linux No Restart
Moves Edit > Preferences to Tools > Options…
ChatZilla zh-CN language pack for ChatZilla 0.9.91.1
XPCOMViewer is tiny tool for exploring XPCOM components.