In addition to debugging web sites, Firebug is the most popular and powerful web development tool for web security testing and for web site performance analysis. Approximately 1.7 million users have Firebug installed as of Oct. The Firebug Working Group oversees the open source development and extensions of Firebug.
Firebug was initially written by Joe Hewitt, one of the original Firefox creators. This does not change the site permanently, it only gives you a visual reference to what it would look like if it were changed that way.įirebug is free and open source, licensed under the BSD license. You can change the entire layout of the website by modifying the existing source code to see a live effect on the screen.
It also has a JavaScript console for logging errors and watching values, as well as a "Net" feature which monitors the amount of time in milliseconds it takes to execute scripts and load images on the page. The Firebug extension for Mozilla Firefox allows the debugging, editing, and monitoring of any website's CSS, HTML, DOM, JavaScript, and provides other Web development tools. While Firebug focuses on JavaScript performance and provides detailed information about JavaScript function calls during the profiling session, the Performance Tool in the DevTools offers a broad spectrum of information regarding a website's performance but doesn't go into detail regarding JavaScript function calls.Firebug in action on the wiki's Main Page. This is the part where Firebug and the DevTools differ the most, because the outputs are completely different. it also provides information about HTML parsing or layout.
The output of the Call Tree is the one that comes nearest to the output in Firebug, but the Performance panel provides much more information than just the JavaScript performance. A profile can be created via console.profile() and console.profileEnd() like in Firebug or via the "Start Recording Performance" button in the Performance Tool. The DevTools provide advanced tooling regarding performance profiling. Firebug allows to profile JavaScript performance via the "Profile" button within the Console panel or the console.profile() and console.profileEnd() commands.
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