Add-ons

User Agent Switcher by chrispederick

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

FireFTP by Mime Čuvalo

FireFTP is a free, secure, cross-platform FTP/SFTP client for Waterfox which provides easy and intuitive access to FTP/SFTP servers.

Check out my new project, FireSSH!

Live HTTP Headers by Daniel Savard, Nikolas Co

View HTTP headers of a page and while browsing.

HttpFox by Martin Theimer

An HTTP analyzer addon for Firefox

Font Finder by Ben Dodson, Eric Caron, others

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.

Collector's Note "Easy and fast to use - use the eyedropper tool OR highlight and right click. And it gives me exactly the info I need: font stack vs. rendered font, size, color, spacing - without overloading me with info I don't need or want to search through" Open source (GNU)

WorldIP - Geo Add-on with Security Features by Alrond

Professional Geo Add-on with security features and advanced network tools. Anti-phishing. Protection against DNS spoofing and fake sites. All DNS records for domain. The real location of web server, country flag, extended information about datacenter

View Dependencies by Florian QUEZE

View Dependencies adds a tab to the Page Info window, in which it lists all the files which were loaded to show the current page.

XHTML Mobile Profile by Gareth Hunt

Firefox does not natively support the mime-type application/vnd.wap.xhtml+xml. This is one of the possible mime-types for XHTML Mobile Profile. This addon adds support for this mime-type.

Collector's Note "A brilliant WAP emulator/mobile profile script, does everything I need and more!"

Force RTL by Kai Liu, Ehsan Akhgari, others

Force a LTR locale to behave as if it was a RTL locale.

hitsniffer visitors monitoring by San

hitsniffer analytics is a powerful and simple to use real time visitors activity monitoring tool for your website and blog. allows you to monitor your website visitors live and get extreme useful stats data.

Console² by Philip Chee, zeniko

Console² (pronounced Console Squared or Console Two) replaces the JavaScript Console with what could be the next generation Error Console. From v0.5 includes the Console Filter extension previously available separately from the Console² website.

Collector's Note "A must for every web or extension developer, thx!" Also "anyone who uses add-ons or userChrome CSS can benefit from it, since it helps pin down where errors come from. I have also found it very useful in blocking output from sites which create multitudes of syntax errors (Gmail is a leader) which just confuse the issue."