Resize browser windows with Selenium WebDriver in Ruby

gistfile1.rb

driver = WebDriver.for(:remote, :url => Helper.grid, :desired_capabilities => caps)

width = 1024
height = 768

# Resize window. In Firefox and Chrome, must create a new window to do this.
# http://groups.google.com/group/webdriver/browse_thread/thread/e4e987eeedfdb586
case driver.capabilities[:browser_name]
  when 'firefox', 'chrome'
    handles = driver.window_handles
    driver.execute_script("window.open('about:blank','_blank','width=#{width},height=#{height}');")
    driver.switch_to.window((driver.window_handles - handles).pop)
    driver.execute_script("window.resizeTo(#{width}, #{height}); window.moveTo(0,1);")
  else
    driver.execute_script("window.resizeTo(#{width}, #{height}); window.moveTo(0,1);")
end