Firebug 1.0 Beta (public)

Rejoice of fellow DOM tree viewers, CSS stylesheet editors and HTML tag diggers! Firebug 1.0 Beta is finally available and oh my it is a tool i will never want to miss. Combining DOM Inspector, Javascript Debugger and HTML structure viewer all in one, while beiing able to change any values on the fly or debugging your bugged javascript.

Main features:

• Just the way you like it
• Inspect and edit HTML
• Tweak CSS to perfection
• Visualize CSS metrics
• Monitor network activity (will be my new favorite)
• Debug and profile Javascript
• Quickly find errors
• Explore the DOM
• Logging for Javascript
  

Apart from Firebug beiing available for Firefox there is also a "Lite" Version for IE, Opera and Safari! Integrating Firebug in this way is a little bit "clumsy" though since you have to add a javascript reference into the page you want to debug. Can still be of use, should you be in a location where Firefox is not available or you are not allowed to install extensions.