Selenium と Python を使用して新しいブラウザ タブを効率的に開閉するにはどうすればよいですか?

from selenium import webdriver
from selenium.webdriver.common.keys import Keys

driver = webdriver.Firefox()
driver.get("http://www.google.com/")

# Open a new tab
driver.find_element_by_tag_name('body').send_keys(Keys.COMMAND + 't') # COMMAND + T on OSX, CONTROL + T on others

# Load a page in the new tab
driver.get('http://stackoverflow.com/')

# Make the necessary tests...

# Close the new tab
driver.find_element_by_tag_name('body').send_keys(Keys.COMMAND + 'w') # COMMAND + W on OSX, CONTROL + W on others


driver.close()