Developer Tools

by Zulkarnain K.

50 Add-ons in this Collection

Markdown Viewer by Thiht

Rated 4 out of 5 stars 44 reviews

15,726 users

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

about:addons-memory by Nils Maier

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Experimental

Rated 4 out of 5 stars 121 reviews

28,673 users

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

Extension Auto-Installer by Wladimir Palant

Rated 5 out of 5 stars 35 reviews

3,089 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.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

4,852 users

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

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 42 reviews

7,503 users

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

GitHub Extension Installer by Diego Casorran

Rated 4 out of 5 stars 21 reviews

2,504 users

Install Browser Extensions straight from GitHub Repositories

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

2,170 users

JavaScript Terminal for Firefox.

Key Manager by Subrata Mazumdar

Rated 3 out of 5 stars 21 reviews

516 users

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

Foundstone HTML5 Local Storage Explorer by Foundstone Inc.

Rated 3 out of 5 stars 14 reviews

2,424 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 31 reviews

1,219 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

2,395 users

A suite of tools for developers.

XPather by Viktor Zigo

Rated 4 out of 5 stars 36 reviews

435 users

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

Javascript Command by max1million

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Experimental

Rated 4 out of 5 stars 13 reviews

1,132 users

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

Magnifier by Girish Sharma, Paul Rouget

Rated 3 out of 5 stars 9 reviews

1,453 users

A quick restartless magnifier to debug styles and web pages.

CSSsir by Razum

Rated 5 out of 5 stars 19 reviews

1,864 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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