How to use FireBug and Firepath ?
Lets inspect "Google Search" button on google page.
1.Open FireBug and click on the inspector(rectangle with cursor) and click on the "Google Search" button on Google.com
2.When you click on that button you will be able to see source code and also firebug highlight the source code for that particular element
3.Now Goto firepath option
4.Firepath will highlight both source code and the respective element on the webpage
5.Firepath will shows you the Xpath value by default and here the xpath values is :".//*[@id='tsf']/div/div/center/input"
6.If we want to see css value, we should change the option to css.
7.Sizzle is something like css only, no need to worry about it