FireQuery is a convenient Firefox extension, a Firebug plugin for jQuery development. jQuery expressions are intelligently presented in Firebug. Elements in jQuery collections are highlighted on hover.
FireQuery Features:
1. Console and DOM inspector
2. Attached jQuery data are first class citizens
3. jQuerify: enables you to inject jQuery into any web page
4. jQuery Lint: enables you to automatically inject jQuery Lint into the page as it is loaded (great for ad-hoc code validation)

Requirements:
* Firebug
* Firefox
* SeaMonkey

The license of this software is Free, you can free download and free use this browser plug-ins software.