Developer Tools

by Zulkarnain K.

19 Add-ons in this Collection

SQLite Manager by lazierthanthou

Rated 4 out of 5 stars 354 reviews

91,388 users

Manage any SQLite database on your computer.

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 216 reviews

53,824 users

View HTTP headers of a page and while browsing.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 216 reviews

32,545 users

An HTTP analyzer addon for Firefox

Remote XUL Manager by Jorge Villalobos

Rated 5 out of 5 stars 36 reviews

90,265 users

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 52 reviews

51,215 users

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

DOM Inspector by SeaMonkey Council

Rated 5 out of 5 stars 77 reviews

49,565 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.

about:addons-memory by Nils Maier

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Experimental

Rated 4 out of 5 stars 149 reviews

11,081 users

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

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

1,658 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

110 users

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

Markdown Viewer by Thiht

Rated 4 out of 5 stars 52 reviews

7,649 users

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

Extension Auto-Installer by Wladimir Palant

Rated 5 out of 5 stars 48 reviews

966 users

Important note: This extension will not work in Firefox 57 and above. Providing this functionality in Firefox is no longer possible, the extension is discontinued.

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

876 users

A suite of tools for developers.

InspectorWidget by Sailfish

Rated 5 out of 5 stars 10 reviews

438 users

Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.

JavaScript Object Examiner by Chuck_Baker

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Experimental

Not yet rated

244 users

Display JavaScript object methods and properties for any available scope.

Extension Test by Kris Maglione

Rated 5 out of 5 stars 6 reviews

33 users

A simple add-on for extension testers, especially AMO editors and developers who plan to submit their add-ons to AMO.
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