firebug 1.4.1-1ubuntu2 (powerpc binary) in ubuntu lucid

 Firebug integrates with Firefox to put a wealth of web development tools
 at your fingertips while you browse. You can edit, debug, and monitor CSS,
 HTML, and JavaScript live in any web page.
 .
 Features:
 .
  * Inspect and edit HTML
  * Tweak CSS to perfection
  * Visualize CSS metrics
  * Monitor network activity
  * Debug and profile JavaScript
  * Quickly find errors
  * Explore the DOM
  * Execute JavaScript on the fly
  * Logging for JavaScript