#Include the FireWatir file.
require 'firewatir'
#include the FireWatir Module.
include FireWatir
ff=Firefox.new
#Open yahoo mail.
ff.goto("http://mail.yahoo.com")
#Put your user name.
ff.text_field(:name,"login").set("User_Name")
#Put your password.
ff.text_field(:name,"passwd").set("Password")
#Click Sign In button.
ff.button(:value,"Sign In").click
#Click Sign Out button.
ff.link(:text, "Sign Out").click
#Close the browser.
ff.close