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Extensions for add-on developers.
http://www.gijsk.com/mozilla/chromelist/
Browse all the chrome packages registered with Firefox in a convenient tree view.
http://blog.getfirebug.com/category/chromebug/
Chromebug is the Firebug code adapted for XUL applications. It is the debugger that Firebug developers use to develop Firebug.
http://console2.mozdev.org/
Replaces the JavaScript Console. Display errors filtered by type (Errors, Warnings, Messages), language (JavaScript, CSS, XML) and context (Chrome, Content).
http://ted.mielczarek.org/code/mozilla/extensiondev/
Meta-extension for developers. Allows test JavaScript, prototyping XUL layouts and building XPI packages.
https://addons.mozilla.org/en-US/firefox/addon/javascript-command/
Tools for writing/testing JavaScript on Firefox windows, web pages, and bookmarklets. [Requires Login]
http://dbaron.org/mozilla/leak-monitor/
Detects one very specific type of leak in web sites and chrome JavaScript.
http://www.mrtech.com/
Provides tools to install and manage extensions and themes locally.
http://www.oxymoronical.com/web/firefox/nightly
Adds a few extras useful to those that regularly test nightly builds of Firefox, Thunderbird, Sunbird and Toolkit Seamonkey (Suiterunner). Features: Extension compatibility fixing, titlebar customization, build ID retrieval, screen-shots, talk-back information and leak log analysis.
https://github.com/lazierthanthou/sqlite-manager
Shows the database structure in an intuitive hierarchical tree. Browse and manage tables, indexes, views and triggers.
http://www.oxymoronical.com/web/firefox/updatechannel
Allows you to change the update channel from where your application receives updates.
http://www.clear-code.com/software/uxu/index.html.en
Testing framework for Mozilla add-ons.
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