Firebug (software)
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The Firebug extension for Mozilla Firefox allows the debugging, editing, and monitoring of any website's CSS, HTML, DOM, and JavaScript, and provides other web development tools. Firebug's official website has a complete guide to what it can do.
Firebug was written by Joe Hewitt, one of the original Firefox creators.
The Firebug plugin YSlow is a web development tool and analyzes web pages and tells you why they're slow based on the rules for high performance web sites. It offers
- Performance report card
- HTTP/HTML summary
- List of components in the page
- Tools including JSLint