Dev Tools

by MattDMo

19 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,833 reviews

2,019,477 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...

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 263 reviews

317,704 users

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

Web Developer by chrispederick

Rated 5 out of 5 stars 245 reviews

443,902 users

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

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 356 reviews

131,494 users

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

FireQuery by BinaryAge, Jan Odvarko

Rated 4 out of 5 stars 55 reviews

22,774 users

Firebug plugin for jQuery development

Firepicker by thedarkone2

Rated 5 out of 5 stars 55 reviews

14,895 users

Simple color picker plugin for Firebug.

View Source Chart by Jennifer Madden

Rated 5 out of 5 stars 110 reviews

11,704 users

Inspect the DOM at lightning speed.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

4,886 users

Execute JS is a enhanced JavaScript-Console, where you can comfortably enter and execute arbitrary JavaScript-Code and modify functions...

Illuminations for Developers for Firebug by Steven Roussey

Rated 3 out of 5 stars 8 reviews

13,378 users

Enhances Firebug to understand JavaScript libraries and frameworks, making things more obvious and helpful when debugging. Trial version, fully functional.

Pencil by Dương Thành An, Brainiac

Rated 4 out of 5 stars 89 reviews

1,303 users

Pencil is a Firefox add-on to do GUI prototyping and simple sketching

Firediff by kpdecker

Rated 4 out of 5 stars 16 reviews

11,348 users

Track Changes in Firebug

CSSsir by Razum

Rated 5 out of 5 stars 18 reviews

2,077 users

CSSsir is easy and handy tool which allows you to generate cross-browser code for main CSS- rules in a few clicks.
This CSS3 generator will be useful not only for web-masters and designers but also for common users.

Acebug by Mike Ratcliffe, Harutyun Amirjanyan

Rated 4 out of 5 stars 19 reviews

1,132 users

Syntax highlighting for the Firebug command line using Ace.
Fuzzy auto completion
and more...

JSLinter by Roland Warmerdam

Rated 5 out of 5 stars 1 review

383 users

Analyses all the Javascript files on a web page using JSLint.

FireFlow by sans_sense

Rated 4 out of 5 stars 4 reviews

776 users

Firebug extension to help reverse engineer code flows, does not work with Firefox version 33.0 and Firebug 2.0.4 and above.
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