Firebug, the Firefox extension for live debugging and monitoring CSS, HTML, and Javascript of any website, is a free and open source.

Firebug is a Mozilla Firefox extension. You can install the Firefox extension into your Firefox browser and view the CSS files.

While Firebug is particularly popular among developers and testers, it can prove to be a great tool for learners and newbies too.

If you are wondering how to get started, don’t worry. In this article, we’ll see how you can install and use the various options of Firefox. Additionally, we’ll see how you can use firebug to customize your WordPress theme with custom CSS.
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