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Web Development Evolved - The Firebug you have known and loved
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Web Development Evolved

On November 14, with the launch of Firefox Quantum (AKA 57), support for old school extensions will stop in Firefox. That means Firebug will no longer work for many developers. However, the work continues in the great Firefox devtools. You can try Firefox devtools by updating your release browser or downloading Developer Edition. Read more here



Firebug is free and open source software distributed under the BSD License.

Source Repository Structure

See more information about Firebug repository structure.

  • extension Firebug extension directory.
  • tests Firebug automated test files and test harness.
  • trace Firebug tracing console.

Build Firebug XPI

In order to build Firebug *.xpi package run following in your command line (you need Apache Ant)

$ cd firebug/extension
$ ant

The *.xpi file should be located within ./release directory.

Run Firebug From Source

The extension directory directly contains Firebug extension files and so, you can run Firebug directly from it. This is the recommended way how to quickly test your code changes and provide a patch.

  1. Locate your Firefox profile folder
  2. Open extensions/ folder, create if it doesn't exist.
  3. Create a new text file and put the full path to your development folder inside. (e.g. C:\firebug\extension\ or ~/firebug/extension/). Windows users should retain the OS' slash direction, and everyone should remember to include a closing slash and remove any trailing spaces.
  4. Save the file with Firebug ID as it's name

Hacking on Firebug

See detailed instructions about how to provide a patch to Firebug source.

Further Resources

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