Developer Tools

by Zulkarnain K.

50 Add-ons in this Collection

about:addons-memory by Nils Maier

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Experimental

Rated 4 out of 5 stars 125 reviews

30,340 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 16 reviews

3,502 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.

Markdown Viewer by Thiht

Rated 4 out of 5 stars 42 reviews

14,737 users

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

GitHub Extension Installer by Diego Casorran

Rated 5 out of 5 stars 9 reviews

2,686 users

Install Browser Extensions straight from GitHub Repositories

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 38 reviews

9,110 users

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

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

5,240 users

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

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

2,731 users

A suite of tools for developers.

Rebrand by Mike Kaply

Rated 4 out of 5 stars 13 reviews

4,013 users

This wizard creates an XPI that rebrands Firefox, SeaMonkey or Thunderbird. You can change the brand name as well as the brand images and icons.

User Style Manager by Girish Sharma

Rated 4 out of 5 stars 29 reviews

1,396 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.

Key Manager by Subrata Mazumdar

Rated 3 out of 5 stars 21 reviews

599 users

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

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

2,443 users

JavaScript Terminal for Firefox.

Foundstone HTML5 Local Storage Explorer by Foundstone Inc.

Rated 3 out of 5 stars 14 reviews

2,828 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.

Magnifier by Girish Sharma, Paul Rouget

Rated 3 out of 5 stars 9 reviews

1,599 users

A quick restartless magnifier to debug styles and web pages.

XPather by Viktor Zigo

Rated 4 out of 5 stars 36 reviews

530 users

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

CSSsir by Razum

Rated 5 out of 5 stars 19 reviews

2,126 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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