Developer Tools

by Zulkarnain K.

52 Add-ons in this Collection

DOM Inspector by SeaMonkey Council

Rated 5 out of 5 stars 65 reviews

139,055 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 13 reviews

3,705 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 33 reviews

9,475 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

2,782 users

Install Browser Extensions straight from GitHub Repositories

Markdown Viewer by Thiht

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Rated 4 out of 5 stars 28 reviews

6,564 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

5,730 users

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

JavaScript Terminal by Paul Rouget

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Rated 4 out of 5 stars 5 reviews

3,308 users

JavaScript Terminal for Firefox.

Console² by Philip Chee, zeniko

Rated 5 out of 5 stars 49 reviews

9,963 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.

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

3,150 users

A suite of tools for developers.

Foundstone HTML5 Local Storage Explorer by Foundstone Inc.

Rated 3 out of 5 stars 13 reviews

3,063 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.

User Style Manager by Girish Sharma

Rated 4 out of 5 stars 25 reviews

1,863 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.

CSSsir by Razum

Rated 5 out of 5 stars 18 reviews

2,653 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 4 out of 5 stars 8 reviews

1,891 users

A quick restartless magnifier to debug styles and web pages.

Javascript Command by max1million

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Rated 4 out of 5 stars 13 reviews

2,045 users

For writing/testing javascript on Firefox windows (extension development, etc), web pages, and bookmarklets.

Key Manager by Subrata Mazumdar

Rated 3 out of 5 stars 20 reviews

1,130 users

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