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

29,333 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

3,364 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

13,303 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

2,582 users

Install Browser Extensions straight from GitHub Repositories

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 38 reviews

8,155 users

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

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

2,547 users

A suite of tools for developers.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

4,866 users

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

Key Manager by Subrata Mazumdar

Rated 3 out of 5 stars 21 reviews

557 users

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

User Style Manager by Girish Sharma

Rated 4 out of 5 stars 29 reviews

1,331 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.

Foundstone HTML5 Local Storage Explorer by Foundstone Inc.

Rated 3 out of 5 stars 14 reviews

2,609 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 4 out of 5 stars 8 reviews

1,535 users

A quick restartless magnifier to debug styles and web pages.

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

2,295 users

JavaScript Terminal for Firefox.

Rebrand by Mike Kaply

Rated 4 out of 5 stars 13 reviews

2,806 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.

JSON Inspector by Zulkarnain K.

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Experimental

Not yet rated

325 users

Inspect JSON object from a URL or entered data.
Requires either DOM Inspector or DOM Inspector Plus! [dm] extension.

CSSsir by Razum

Rated 5 out of 5 stars 19 reviews

1,938 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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