Step 1. You should have firefox browser handy. If not, you could download one from :
Step 2. Once you get your firefox browser, you could then download firebug within the browser.
Open Firefox browser and go to Tools-> Options
Go to General and then click Manage Add-ons
Look for firebug in the search criteria. And then click Install besides the plugin.
Normally firebug would show up at the bottom. When you choose Script, you have to click the blue link : Enable
Now click Reload
Have fun and this is end of Instructions.Yay!!