Search Results for tag "developer"


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...

Rated 4 out of 5 stars (2,591)
907,910 users

Web Developer Compatible with Firefox 57+

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

Rated 4 out of 5 stars (464)
268,036 users

Flagfox Compatible with Firefox 57+

Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...

Rated 5 out of 5 stars (826)
252,957 users

DOM Inspector Requires Restart

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.

Rated 5 out of 5 stars (78)
59,437 users

HttpFox Requires Restart

An HTTP analyzer addon for Firefox

Rated 4 out of 5 stars (200)
40,494 users

Html Validator Compatible with Firefox 57+

HTML Validator is a Mozilla extension that adds HTML validation inside Firefox, Mozilla. The number of errors of a HTML page is seen on the form of an icon

For Firefox 56, use 0.974 (see all versions below).
For Firefox 57, see Web Extensions.

Rated 4 out of 5 stars (211)
31,651 users

Disable Add-on Compatibility Checks

Reinstates the extensions.checkCompatibility preference without respect to the current application version.

Rated 4 out of 5 stars (118)
26,534 users

YSlow Requires Restart

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. is the official open source website.

Rated 3 out of 5 stars (210)
26,304 users

Clear Cache Compatible with Firefox 57+

Clear browser cache with a single click or via the F9 key.

F9 Fever! ;)

Rated 4 out of 5 stars (44)
23,128 users

RESTED Compatible with Firefox 57+

A REST client for the rest of us

Rated 4 out of 5 stars (41)
20,953 users

Measure-it Compatible with Firefox 57+

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

Rated 5 out of 5 stars (28)
17,860 users

Java Redirector Compatible with Firefox 57+

Redirects your Browser to the newest version of the javadocs.

Rated 5 out of 5 stars (18)
15,480 users

FirePHP Requires Restart

Log from PHP to a devtools panel.

Rated 4 out of 5 stars (58)
14,918 users

Nightly Tester Tools Compatible with Firefox 57+

Nightly Tester Tools (NTT) is an add-on for aiding testers of Nightly builds of Mozilla apps including Firefox.

Rated 4 out of 5 stars (193)
13,646 users

Octotree Compatible with Firefox 57+

Add-on to display GitHub code in tree format

Rated 5 out of 5 stars (93)
7,742 users

View Source Compatible with Firefox 57+

View Source button to easily open up View Source tab for the web page.

Rated 5 out of 5 stars (10)
7,412 users

MR Tech Toolkit Requires Restart

(Formerly Local Install) The primary goal of this extension is to provide the tools needed to install and manage extensions and themes locally and tons of other features.

Note: With Toolkit 6.0 Auto Archiving is fully working in Firefox 2.0 and temp...

Rated 4 out of 5 stars (134)
6,959 users


Firebug plugin for jQuery development

Rated 4 out of 5 stars (54)
6,701 users

Developer Tools - toolbar button Requires Restart

Access and activate the native Firefox Web Developer tools faster through this toolbar button (menu). Button can be placed on any toolbar.

Rated 5 out of 5 stars (10)
6,196 users

Firepicker Requires Restart

Simple color picker plugin for Firebug.

Rated 5 out of 5 stars (56)
5,141 users