Install Firebug
Navigate to the link: http://getfirebug.com/ and click on the 'Install Firefox' button.
Now follow the steps and install firebug as an add-on in the Mozilla Firefox browser.
Install Firepath
After you have installed firebug you can be able to install firepath.
Navigate to the url: https://addons.mozilla.org/en-US/firefox/addon/firepath/
Navigate to the link: http://getfirebug.com/ and click on the 'Install Firefox' button.
Install Firepath
After you have installed firebug you can be able to install firepath.
Navigate to the url: https://addons.mozilla.org/en-US/firefox/addon/firepath/
Click on the button 'Add to Firefox' and follow the steps to install firepath on firebug.
After you have installed firepath successfully you can see as given below: 
