Developer Tools

by Zulkarnain K.

50 Add-ons in this Collection

JavaScript Deobfuscator by Wladimir Palant

Rated 5 out of 5 stars 26 reviews

31,749 users

This add-on shows you what JavaScript code runs on a web page, even if it is obfuscated and generated on the fly. Simply open JavaScript Deobfuscator from the Web Developer menu and watch the scripts being compiled/executed.

DOM Inspector by SeaMonkey Council

Rated 5 out of 5 stars 75 reviews

74,828 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.

about:addons-memory by Nils Maier

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Experimental

Rated 4 out of 5 stars 141 reviews

18,294 users

Adds an about:addons-memory page that details add-on memory usage

Markdown Viewer by Thiht

Rated 4 out of 5 stars 48 reviews

13,752 users

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

Extension Auto-Installer by Wladimir Palant

Rated 5 out of 5 stars 49 reviews

1,940 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.

Key Manager by Subrata Mazumdar

Rated 3 out of 5 stars 21 reviews

92 users

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

User Style Manager by Girish Sharma

Rated 4 out of 5 stars 28 reviews

602 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.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

3,164 users

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

GitHub Extension Installer by Diego Casorran

Rated 4 out of 5 stars 24 reviews

1,708 users

Install Browser Extensions straight from GitHub Repositories

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

1,541 users

A suite of tools for developers.

Console² by Philip Chee, zeniko

Rated 5 out of 5 stars 47 reviews

3,492 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.

Foundstone HTML5 Local Storage Explorer by Foundstone Inc.

Rated 3 out of 5 stars 14 reviews

1,520 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.

InspectorWidget by Sailfish

Rated 5 out of 5 stars 10 reviews

677 users

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

CSSsir by Razum

Rated 5 out of 5 stars 18 reviews

1,227 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.

Magnifier by Girish Sharma, Paul Rouget

Rated 3 out of 5 stars 9 reviews

975 users

A quick restartless magnifier to debug styles and web pages.
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