Firebug Tutorial

What is Firebug

Firebug is a free web development tool.

In this tutorial we are going to discuss following -

  • How to install Firebug.
  • Inspect and edit HTML with Firebug.
  • Inspect and edit CSS with Firebug.
  • Debug and profile JavaScript with Firebug.
  • Execute JavaScript on the fly with Firebug.
  • Logging for JavaScript with Firebug.
  • Monitor network activity with Firebug.

Installing Firebug

You can download and install Firebug from https://addons.mozilla.org/en-US/firefox/addon/1843/.

After visiting the page referenced above, click on the Download button, it shows a window to and click on the Install button there. It takes a while and asks you to restart the Firefox browser. Once rebooted, click on Firebug under Firefox(top left corner of your Firefox browser) > Web developer.

At this stage firebug is not activated. If you click that icon, Firebug will get activated.

Components of Firebug

Firebug Options

firebug options

Click an element in the page to inspect


Go back and forward

go back and forward

Show command line


Panel selector




HTML Panel


CSS Panel


Script Panel


DOM Panel


Net Panel (used for profiling so useful for page speed measuring and optimization)


Buttons for other activities

other buttons

1 - Minimize Firebug.

2 - Attach Firebug to the browser window.

3 - Deactivate Firebug for this site.

Next: Inspect and edit HTML and CSS with Firebug

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