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Firebug is a web development tool that facilitates the debugging, editing, and monitoring of any website.

Firebug is a web development tool that facilitates the debugging, editing, and monitoring of any website's CSS, HTML, DOM, XHR, and JavaScript; it also provides other web development tools.

Firebug's JavaScript panel can log errors, profile function calls, and enable the developer to run arbitrary JavaScript. Its net panel can monitor URLs that the browser requests, such as external CSS, JavaScript, and image files. 

The net panel can display both request headers and response headers for each page asset; it can also estimate the time each asset took to load.

Firebug is free and open source; it is licensed under the BSD license. Firebug was initially written in January 2006[4] by Joe Hewitt, one of the original Firefox creators. The Firebug Working Group oversees the open source development and extension of Firebug. 

It has two major implementations: an extension (add-on) for Mozilla Firefox and a bookmarklet implementation called Firebug Lite. A cross-browser version is in development. Currently, the Firebug add-on has over 3 million active daily users.

In addition to debugging web pages, Firebug is a useful tool for web security testing and web page performance analysis.

 Features.

  • Inspect HTML and modify style and layout in real-time
  • Use the most advanced JavaScript debugger available for any browser
  • Accurately analyze network usage and performance
  • Extend Firebug and add features to make Firebug even more powerful
  • Get the information you need to get it done with Firebug.

Firebug integrates with Firefox to put a wealth of web development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

Always at your service

Firebug is always just a keystroke away, but it never gets in your way. You can open Firebug in a separate window, or as a bar at the bottom of your browser. Firebug also gives you fine-grained control over which websites you want to enable it for.
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Inspect and edit HTML

Firebug makes it simple to find HTML elements buried deep in the page. Once you've found what you're looking for, Firebug gives you a wealth of information, and lets you edit the HTML live.
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Tweak CSS to perfection

Firebug's CSS tabs tell you everything you need to know about the styles in your web pages, and if you don't like what it's telling you, you can make changes and see them take effect instantly.
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Visualize CSS metrics

When your CSS boxes aren't lining up correctly it can be difficult to understand why. Let Firebug be your eyes and it will measure and illustrate all the offsets, margins, borders, padding, and sizes for you.
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Monitor network activity

Your pages are taking a long time to load, but why? Did you go crazy and write too much JavaScript? Did you forget to compress your images? Are your ad partner's servers taking a siesta? Firebug breaks it all down for you file-by-file.
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Debug and profile JavaScript

Firebug includes a powerful JavaScript debugger that lets you pause execution at any time and have look at the state of the world. If your code is a little sluggish, use the JavaScript profiler to measure performance and find bottlenecks fast.
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Quickly find errors


When things go wrong, Firebug lets you know immediately and gives you detailed and useful information about errors in JavaScript, CSS, and XML.
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Explore the DOM

The Document Object Model is a great big hierarchy of objects and functions just waiting to be tickled by JavaScript. Firebug helps you find DOM objects quickly and then edit them on the fly.
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Execute JavaScript on the fly

The command line is one of the oldest tools in the programming toolbox. Firebug gives you a good ol' fashioned command line for JavaScript complete with very modern amenities.
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Logging for JavaScript

Having a fancy JavaScript debugger is great, but sometimes the fastest way to find bugs is just to dump as much information to the console as you can. Firebug gives you a set of powerful logging functions that help you get answers fast.
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Just the way you like it

Using Firebug gives a lot of possibilities for web development to your hands. Though you're feeling something is not working as you would like it to? No problem. Firebug offers a lot of options to adjust it to your needs.

Search and you shall find

Sometimes you know what you're looking for, but you can't see it in the panel. Using the quick search box in Firebug's toolbar you can search inside Firebug's panels and see the results highlighted as you type.


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About Hugo Repetto

Ubuntu is a Linux distribution that offers an operating system predominantly focused on desktop computers but also provides support for servers. Based on Debian GNU / Linux, Ubuntu focuses on ease of use, freedom in usage restriction, regular releases (every 6 months) and ease of installation.
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