Developer Tools

by Zulkarnain K.

51 Add-ons in this Collection

DOM Inspector by SeaMonkey Council

Rated 5 out of 5 stars 66 reviews

120,956 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.

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 35 reviews

9,530 users

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

Markdown Viewer by Thiht

Rated 4 out of 5 stars 34 reviews

10,233 users

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

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

2,551 users

JavaScript Terminal for Firefox.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

5,203 users

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

Foundstone HTML5 Local Storage Explorer by Foundstone Inc.

Rated 3 out of 5 stars 13 reviews

2,821 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.

Key Manager by Subrata Mazumdar

Rated 3 out of 5 stars 21 reviews

964 users

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

Javascript Command by max1million

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Experimental

Rated 4 out of 5 stars 13 reviews

1,493 users

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

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

2,883 users

A suite of tools for developers.

User Style Manager by Girish Sharma

Rated 4 out of 5 stars 29 reviews

1,638 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.

Extension Auto-Installer by Wladimir Palant

Rated 5 out of 5 stars 17 reviews

3,750 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.

Console² by Philip Chee, zeniko

Rated 5 out of 5 stars 49 reviews

7,479 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.

GitHub Extension Installer by Diego Casorran

Rated 5 out of 5 stars 9 reviews

2,858 users

Install Browser Extensions straight from GitHub Repositories

Magnifier by Girish Sharma, Paul Rouget

Rated 4 out of 5 stars 8 reviews

1,673 users

A quick restartless magnifier to debug styles and web pages.

CSSsir by Razum

Rated 5 out of 5 stars 18 reviews

2,242 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.
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