Developer Tools

by Zulkarnain K.

51 Add-ons in this Collection

Extension Auto-Installer by Wladimir Palant

Rated 5 out of 5 stars 16 reviews

3,585 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.

about:addons-memory by Nils Maier

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

Markdown Viewer by Thiht

Rated 4 out of 5 stars 35 reviews

10,168 users

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

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 36 reviews

9,090 users

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

GitHub Extension Installer by Diego Casorran

Rated 5 out of 5 stars 9 reviews

2,722 users

Install Browser Extensions straight from GitHub Repositories

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

4,834 users

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

User Style Manager by Girish Sharma

Rated 4 out of 5 stars 29 reviews

1,629 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.

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

2,715 users

A suite of tools for developers.

Foundstone HTML5 Local Storage Explorer by Foundstone Inc.

Rated 3 out of 5 stars 13 reviews

2,737 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

798 users

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

CSSsir by Razum

Rated 5 out of 5 stars 18 reviews

2,182 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.

JavaScript Terminal by Paul Rouget

Download Now

Experimental

Rated 4 out of 5 stars 5 reviews

2,439 users

JavaScript Terminal for Firefox.

Magnifier by Girish Sharma, Paul Rouget

Rated 4 out of 5 stars 8 reviews

1,630 users

A quick restartless magnifier to debug styles and web pages.

XPather by Viktor Zigo

Rated 4 out of 5 stars 35 reviews

599 users

Feature rich XPath generator, editor, inspector and simple extraction tool...

Console² by Philip Chee, zeniko

Rated 5 out of 5 stars 49 reviews

7,139 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.
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