Firebug is an extension for Firefox, but what happens when you need to test your pages in Internet Explorer, Opera, and Safari? The solution is Firebug Lite, a JavaScript file you can insert into your pages to simulate some Firebug features in browsers that are not named "Firefox".

Firebug Lite creates the variable "firebug" and doesn't affect or interfere with HTML elements that aren't created by itself.

Installing Firebug Lite 1.2

Insert this line of code into any page that you want to contain Firebug lite:

    <script type='text/javascript' 
src='http://getfirebug.com/releases/lite/1.2/firebug-lite-compressed.js'>
   


That's all.. ^^
The script's very useful and I use this script during my internship, coz I have to design and build a website using Internet Explorer (I.E). So, if you need Firebug in I.E/ Opera/ Safari/ etc browsers, you can use this amazing script. Here is the screenshoot :