Firebug v2.0 for Firefox

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Firebug 2 introduces many new features and bug fixes also because we completely removed dependency on the ancient Firefox debugging engine (aka JSD1) and incorporated new debugging engine known as JSD2.

 

• Syntax Highlighting
  
• Pretty Print
  
• DOM Events Inspector
  
• Searching in the HTML Panel
  
• Code Auto Completion
  
• JavaScript Expressions Inspector
  
• Console Log Grouping
  
• Inspect JavaScript Function Return Value
  
• Show/Hide Firebug Panels
  
• Displaying Original CSS Color Values
  
• Quickly create new HTML attribute
  
• Inspect Registered Mutation Observers