by David Fichtmueller

15 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,840 reviews

2,455,828 users

Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 1,012 reviews

1,325,491 users

Customize the way a web page displays or behaves, by using small bits of JavaScript.

Stylish by userstyles.org

Rated 4 out of 5 stars 834 reviews

491,534 users

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Tumblr, and many, many other sites. You can even customize Firefox and other programs themselves.

Web Developer by chrispederick

Rated 5 out of 5 stars 249 reviews

538,877 users

The Web Developer extension adds various web developer tools to the browser.

FireFTP by Mime Čuvalo

Rated 4 out of 5 stars 972 reviews

527,473 users

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

Check out my new project, FireSSH!

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 312 reviews

297,887 users

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 358 reviews

160,920 users

Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

Image Zoom by Jason Adams

Rated 4 out of 5 stars 346 reviews

151,896 users

Adds zoom and rotation functionality for images...

Quick Locale Switcher by ppclick

Rated 3 out of 5 stars 88 reviews

246,250 users

Allows you to quickly switch to a different language (User Interface, Spell Checker Dictionary and Website content) in your Mozilla application.

DOM Inspector by SeaMonkey Council

Rated 5 out of 5 stars 70 reviews

135,032 users

DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.

Locale Switcher by bsmedberg

Rated 4 out of 5 stars 26 reviews

66,965 users

Displays a menu item for switching the application locale.

Screengrab by Andy M

Rated 4 out of 5 stars 587 reviews

21,842 users

Screengrab! saves webpages as images... but not for new versions of Firefox.

FF changes too fast and I don't have the time to maintain it anymore. Bugs have developed that I am not in a position to investigate.

Therefore, Screengrab is EOL.

Header Spy by IronNem

Rated 4 out of 5 stars 18 reviews

6,066 users

Shows HTTP headers on statusbar.

UrlParams by Erik Schmidt

Rated 4 out of 5 stars 38 reviews

711 users

Shows you the GET and POST parameters of the current website in the sidebar...

Console² by Philip Chee, zeniko

Rated 5 out of 5 stars 49 reviews

7,929 users

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.

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