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Compatibility table:

Firefox 3.6 with Firebug 1.7.3Firefox 4.0 with Firebug 1.7.3Firefox 5.0 with Firebug 1.8.2 (and also Firebug 1.7.3)Firefox 6.0 with Firebug 1.8.2 (and also Firebug 1.9)Firefox 7.0 with Firebug 1.8.2 (and also Firebug 1.9)Firefox 8.0 with Firebug 1.8.3 (and also Firebug 1.9)Firefox 9.0 with Firebug 1.8.4 (and also Firebug 1.9)Firefox 10.0 with Firebug 1.9Firefox 11.0 with Firebug 1.9Firefox 12.0 with Firebug 1.9Firefox 13.0 with Firebug 1.10 (and also Firebug 1.9)Firefox 14.0 with Firebug 1.10Firefox 15.0 with Firebug 1.10Firefox 16.0 with Firebug 1.10Firefox 17.0 with Firebug 1.11 (and also Firebug 1.10)Firefox 18.0 with Firebug 1.11Firefox 19.0 with Firebug 1.11Firefox 20.0 with Firebug 1.11Firefox 21.0 with Firebug 1.11Firefox 22.0 with Firebug 1.11Firefox 23.0 with Firebug 1.12 (and also Firebug 1.11)Firefox 24.0 with Firebug 1.12Firefox 25.0 with Firebug 1.12Firefox 26.0 with Firebug 1.12Firefox 27.0 with Firebug 1.12Firefox 28.0 with Firebug 1.12Firefox 29.0 with Firebug 1.12Firefox 30.0 with Firebug 2.0 (and also Firebug 1.12)Firefox 31.0 with Firebug 2.0 (and also Firebug 1.12)Firefox 32.0 with Firebug 2.0 (and also Firebug 1.12)
Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

Visit the Firebug website for documentation and screen shots: http://getfirebug.com
Ask questions on Firebug newsgroup: https://groups.google.com/forum/#!forum/firebug
Report an issue: http://code.google.com/p/fbug/issues/list

Please note that bug reports or feature requests in comments on this page won't be tracked. Use the issue tracker or Firebug newsgroup instead thanks!