This is the list of firefox plugins i use

• Web Developer
  
  This extension allow you to, resize you broser window, show hidden form fields, disable javascript, delete cache and a lot of useful task for the web developers
• ColorZilla
  
  Get the rgb color of any element on your web page pretty easy
• View Source Chart
  
  Get the page’s source code including the elements generated by javascript with a pretty cool color chart
• Firebug
  
  Pretty good plugin that allows you to edit, debug, and monitor CSS, HTML, and JavaScript right from Firefox