Web and Developer Tools

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DOM Inspector Requires Restart

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.

Rated 5 out of 5 stars (78)

15,171 users

JavaScript Debugger Requires Restart

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.

Rated 4 out of 5 stars (52)

1,121 users

Zing! Locale Switcher

Want to change from one language to another? Zing! and the locale is switched.

Rated 5 out of 5 stars (2)

0 users

Config Descriptions

Shows source comments for advanced application preferences in about:config

Rated 5 out of 5 stars (25)

9 users

SeaMonkey Debug and QA UI Requires Restart

Provides Additional Debug and QA UI for SeaMonkey development and testing.

Rated 3 out of 5 stars (3)

209 users

SQLite Manager Requires Restart

Manage any SQLite database on your computer.

Rated 4 out of 5 stars (354)

94 users

Stylish-Custom Requires Restart

custom additions to Stylish extension

Rated 4 out of 5 stars (10)

8 users

UrlParams Requires Restart

Shows you the GET and POST parameters of the current website in the sidebar...

Rated 4 out of 5 stars (39)

0 users

User Agent Changer Requires Restart

Adds a menu and a toolbar button to change the user agent of a browser.

Rated 4 out of 5 stars (8)

5 users

View Source Requires Restart

Shows all source files of a webpage.

Rated 4 out of 5 stars (7)

1 user

Key Manager Requires Restart

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

Rated 3 out of 5 stars (21)

1 user

IP Flager

Shows country flag for the website in the location bar.

Rated 5 out of 5 stars (4)

3 users

MR Tech About:About Requires Restart

Adds the following "about:" options to the Help menu

Rated 3 out of 5 stars (8)

0 users

GitHub Extension Installer

Install Browser Extensions straight from GitHub Repositories

Rated 4 out of 5 stars (24)

1 user

Copy Pure Text Requires Restart

Allows to copy selected text as plain text by adding a 'Copy as Text' menu item to context menu.

Rated 4 out of 5 stars (15)

10 users

jQuery Requires Restart

jQuery and jQuery UI embedded in browser

Rated 4 out of 5 stars (7)

1 user

fixedzoomthumb Requires Restart

Shows Desktop size image when you hover over a thumbnail .Works with many sites including Amazon, Facebook, Flickr, YouTube.

Rated 5 out of 5 stars (3)

1 user

Relaxed the HTML Validator Requires Restart

"Relaxed" is a HTML validator which validates HTML documents using it's own schema definitions written in Relax NG with embedded Schematron patterns.

Rated 2 out of 5 stars (4)

0 users

Web Server Check Tool Requires Restart

A tool to perform basic checks on web and DAV servers.

Not yet rated

2 users

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Debugger Server Enabler

Starts the remote debugger server.

Not yet rated

1 user