Add-ons

DownThemAll! by Nils Maier, Federico Parodi, others

The first and only download manager/accelerator built inside Firefox!

FlashGot Mass Downloader by Giorgio Maone

Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.

German Dictionary by KaiRo

German Dictionary (new Orthography) for spellchecking in Mozilla products

British English Dictionary by Mark Tyndall

British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.

To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".

ReminderFox by Tom Mutdosch, Daniel Lee, others

ReminderFox displays and manages lists of reminders and tasks. ReminderFox uses easy-to-use lists with warnings/alarms to remind you of all your important appointments.
Synchronize ReminderFox with other calendars as well.

ChatZilla by Gijs Kruitbosch, Robert Ginda, others

A clean, easy to use and highly extensible Internet Relay Chat (IRC) client.

Romanian spellchecking dictionary by archeus, rospell

Romanian spellchecking dictionary for Firefox.

URL Fixer by eyeo GmbH

URL Fixer fixes common typos in URLs entered in the address bar. It will fix errors like "google.con" or "youtube,com". You have the option of being asked to confirm corrections before they are applied.

Puppy Dogs Christmas by MaDonna

More Puppy Dogs by MaDonna by MaDonna