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History Janitor

Firefox does not give an option to remove the oldest entries from the history. History Janitor automatically purges history entries on Firefox startup. The user is allowed to specify a number of days. Everything older than this number is deleted!

Rated 3 out of 5 stars (11)
1,779 users

TheRealURL

Get URL information: expand short URLs, get title and content type information without visiting the site.

UPDATE, AUG 2013: THIS EXTENSION IS NO LONGER SUPPORTED. The source is open - if you wish to take on the development, you're welcome.

Rated 3 out of 5 stars (7)
528 users

No More .org No Restart

No More .org prevents Firefox from loading websites with .org in the URL. This add-on was made for testing in Firefox

Rated 3 out of 5 stars (3)
2 users

superbar

superaddon!

Rated 3 out of 5 stars (3)
8 users

Clines

Clines, a little game

Rated 3 out of 5 stars (3)
94 users

CSHelper

This extension packages versions of the CamStudio recorder application and the XVID Codec. It is primarily intended to be used with the screen capture feature of the Video DownloadHelper add-on, when on Windows.

Rated 3 out of 5 stars (16)
55,347 users

Duplicate Tab Blocker No Restart

Prevent duplicate tabs. Allow only one tab for a url. If you click a link that is already opened in a tab, then existing tab would be focused instead of opening a new tab. This works even across firefox windows.

Rated 3 out of 5 stars (10)
924 users

EditCSS

Stylesheet modifier in the Sidebar.

Rated 3 out of 5 stars (12)
5,820 users

Whois Lookup & Hosting & DNS & Site Flags Firefox

IP Whois Lookup & Website Reviews & Rating. Display country flag indicating website location. Alexa and Norton Antivirus Site Adviser. Supported: GoDaddy, NetworkSolutions, Dotster, 1and1, NameCheap, Register, Yahoo, 123-Reg, FatCow, Enom, FastHosts.

Rated 3 out of 5 stars (9)
6,199 users

Add Search Engines for SeaMonkey

Add missing search-engine detection to SeaMonkey

Rated 4 out of 5 stars (2)
79 users

ZoneMinder Client

ZoneMinder Client is a Firefox Extension that provides toolbar buttons and other features to help you when connecting to your ZoneMinder Server.

Rated 4 out of 5 stars (2)
462 users

PreviousPage

Shows previous page on the left side

Rated 4 out of 5 stars (2)
16 users

YouTube Videos Download in one click

Download YouTube videos by clicking a button underneath videos in YouTube. Save YouTube videos and songs in 1080p (HD) MP4 or FLV format.

Rated 3 out of 5 stars (19)
4,662 users

Hash Password Generator

Generates different passwords for each website using a choice of multiple algorithms.

Rated 3 out of 5 stars (4)
338 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)
515 users

Amazing Media Browser

A Multimedia Download Tool

Rated 3 out of 5 stars (21)
507 users

Web Cache View Plus

This addon allow you to restore web page from web cache (Google, Coral or WA)

Rated 3 out of 5 stars (5)
2,094 users

log2stas LiveJournal Add-on

a) Auto-expand comments threads b) Copy a fragment of text or link to a picture to LJ editor from other pages. c) Simplify use of lj-cut d) Allow quickly switch between anonymous and normal browsing.

Rated 3 out of 5 stars (3)
256 users

Stylish Tools

Quicker access to several Stylish features through a toolbar button and/or keyboard shortcuts. Available for Firefox, Thunderbird, and SeaMonkey

Rated 4 out of 5 stars (1)
1,101 users

Hyperactive No Restart

Scans hyperlinks in composed messages and alerts if one of the hyperlinks is broken.

Rated 4 out of 5 stars (1)
24 users