Firebug is a web developer’s best friend. It is a Firefox add-on that makes it very easy to debug and develop web pages. It provides you with a way to inspect page elements and perform many other functions as well. But what about Firebug on other browsers?
<script type='text/javascript' src='http://getfirebug.com/releases/lite/1.2/firebug-lite-compressed.js'> </script>
Check it out on this link. http://www.makeuseof.com/tag/install-firebug-for-browsers-other-than-firefox/
The limitation is that the javascript above must be on the page you are inspecting.