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 (2,596)
949,447 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 (465)
280,906 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 (828)
262,468 users

Java Redirector Compatible with Firefox 57+

Redirects your Browser to the newest version of the javadocs.

Rated 5 out of 5 stars (18)
16,278 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)
24,446 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)
19,012 users

RESTED Compatible with Firefox 57+

A REST client for the rest of us

Rated 4 out of 5 stars (41)
22,119 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)
32,918 users

HttpFox Requires Restart

An HTTP analyzer addon for Firefox

Rated 4 out of 5 stars (200)
42,387 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)
13,995 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)
7,648 users

Form Filler Compatible with Firefox 57+

This extension allows you to fill all form inputs (textboxes, textareas, radio buttons, dropdowns, etc.) with **random/dummy** data.

The purpose of this extension is to help developers test their forms quickly and easily.

Rated 5 out of 5 stars (18)
2,610 users

Octotree Compatible with Firefox 57+

Add-on to display GitHub code in tree format

Rated 5 out of 5 stars (96)
8,086 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)
27,041 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)
27,491 users

JSONovich Compatible with Firefox 57+

Pretty-prints JSON content in the browser for easy, unobtrusive viewing.

Rated 4 out of 5 stars (47)
5,284 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)
61,816 users

FirePHP Requires Restart

Log from PHP to a devtools panel.

Rated 4 out of 5 stars (58)
15,537 users

Fresh Dom Tree View Compatible with Firefox 57+

Web developers can inspect the DOM in a simple, intuitive way - like a pine tree!
On a web page, right-click and select Fresh Dom Tree View. Then explore: click within the generated dom tree, or mouse-over within the web page.

Rated 5 out of 5 stars (1)
349 users

Display Page Resolution Compatible with Firefox 57+

Displays the page's current resolution in a tidy box at the top right.
Requires zero permissions and completely open source.

Rated 5 out of 5 stars (2)
260 users