Selenium version: 2.19.1-py2.6
OS: W7 64
Browser: Firefox
Browser version: 10.0.1

Hi

As in the summary, it seems that the selenium python bindings  do not report a handle
for every tab opened, but only for every window.
As far as i know, this problem does not exist in ruby bindings and java bindings.

the following code should reproduce the issue

from selenium import webdriver
import time


def main():
    profile = webdriver.FirefoxProfile() 
    profile.set_preference("browser.link.open_newwindow", 3)
    profile.update_preferences()
    driver = webdriver.Firefox( firefox_profile=profile )
#    driver.get("http://www.ibm.com")
    driver.execute_script("window.open('http://www.google.com');") 
    driver.execute_script("window.open('http://www.yahoo.com');") 
    driver.execute_script("window.open('http://www.oracle.com');") 
    time.sleep(10)
    print driver.window_handles
    print driver.current_window_handle
    raw_input("Press Enter to continue...")
    driver.quit()

if __name__ == "__main__":
    main()