If you are a web developer or web designer then this extension is only designed for you to make your development simple, easy. You must install firebug which is a Firefox extension. Firebug offers you a wide range of functionality to
- Inspect HTML and modify style and layout in real-time
- Use the most advanced JavaScript debugger available for any browser
- Accurately analyze network usage and performance
- Extend Firebug and add features to make Firebug even more powerful
- Get the information you need to get it done with Firebug.
Other features that this extension offers are
- Monitor and analyze network performance, to understand what elements might be slowing your website down.
- Inspect the HTML code by viewing the source of any page in real time, filtering specific elements and editing them if necessary.
- Inspect and edit CSS and JavaScript as well.
- Test your pages to see if they contain errors, and debug them with the help of Firebug.
- Use the Firebug rulers and boxes to analyze and optimize the layout on your pages.
Firefox: Download Here