Developer Tools

by Zulkarnain K.

51 Add-ons in this Collection

DOM Inspector by SeaMonkey Council

Rated 5 out of 5 stars 61 reviews

139,003 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.

Extension Auto-Installer by Wladimir Palant

Rated 5 out of 5 stars 12 reviews

3,910 users

Extension Auto-Installer is a helper for Firefox/SeaMonkey/Thunderbird extension developers: it allows automatically adding or updating browser extensions, e.g. via command line tools. This makes testing your changes easier.

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 30 reviews

8,840 users

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

GitHub Extension Installer by Diego Casorran

Rated 5 out of 5 stars 8 reviews

2,354 users

Install Browser Extensions straight from GitHub Repositories

Markdown Viewer by Thiht

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Experimental

Rated 4 out of 5 stars 27 reviews

5,179 users

Markdown document viewer.
Allows to visualize formatted markdown documents in browser.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

5,919 users

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

Console² by Philip Chee, zeniko

Rated 5 out of 5 stars 47 reviews

10,996 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.

Extension Test by Kris Maglione

Rated 5 out of 5 stars 6 reviews

156 users

A simple add-on for extension testers, especially AMO editors and developers who plan to submit their add-ons to AMO.

User Style Manager by Girish Sharma

Rated 4 out of 5 stars 23 reviews

1,936 users

Easiest way to Add and Manage Custom User Styles in Firefox.
Add, Edit, enable, disable and delete in-numerous User Style Sheets to redesign the Firefox and the Web.

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

3,694 users

JavaScript Terminal for Firefox.

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

3,188 users

A suite of tools for developers.

Foundstone HTML5 Local Storage Explorer by Foundstone Inc.

Rated 3 out of 5 stars 13 reviews

3,056 users

Foundstone HTML5 Local Storage Explorer allows for viewing, modifying and deleting of data items stored in the browser's LocalStorage. LocalStorage is a client side storage technology introduced in HTML5.

CSSsir by Razum

Rated 5 out of 5 stars 18 reviews

2,760 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.

Key Manager by Subrata Mazumdar

KeyManager Tool: Firefox Add-on for Key Generation, Certificate Enrollment, CRL Signing, and Identity and Authority Delegation

InspectorWidget by Sailfish

Rated 5 out of 5 stars 6 reviews

1,277 users

Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.
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