Gecko debugging – Firefox

Firefox is based on the Gecko open source layout engine used in many applications developed by the Mozilla Foundation and the Mozilla Corporation. It offers good debugging tools and it's evolving quickly, including innovative projects such as Desktop WebRT, which lets you build a desktop web application at runtime that provides web apps with a native-like look and feel along with platform integration APIs on Windows, OS X, and other desktop platforms.

If you are not developing apps for Android or iOS, you can use the Firefox layout engine, which offers some powerful development and debugging tools. Let's quickly explore how to use Firefox/Firebug to inspect and debug your app; as you will see, there are several similarities between the debug tools available in WebKit and Firefox.

Firebug integrated with Firefox puts a great set of developer tools at your fingertips that rivals the features of the WebKit Web Inspector. In order to install the Firebug...