Firebug for Firefox

Firebug 1.5.4
  • Production release, compatible with: Firefox 3.5-3.6
  • Release notes
  • What's new in Firebug 1.5
    • Enhanced Inspector
    • More accurate Net panel timings
    • Break on HTML mutation
    • MathML and SVG namespace support
    • Break on XHR
    • Improved HTML editing
    • Persist buttons on Console and Net panel
    • Separate Computed CSS and Style subpanels
    • Many many bugfixes and stability improvements
Firebug 1.6: Beta
  • In final testing. See Known Issues
  • Compatible with: Firefox 3.6-4.0

Firebug for Other Browsers

Firebug Lite
Not running Firefox? Firebug Lite is a bookmarklet that provides a lightweight version of Firebug.

Firebug Extensions

Extensions
See wiki for list of Firebug extensions.
Swarm
Try the Firebug Swarm! A collection of Firebug extensions tested with Firebug.

Older Versions of Firebug

Looking for Firebug 1.4 or an older version? Check the downloads directory.