How do I get the URL of the active tab in Firefox/IE/Chrome?

[He Jibo]

Hi,
I am writing a small program, which needs to get the URL of the active
tab in either of firefox, internet exploerer or chrome.
My need is similar as the one posted at,
http://stackoverflow.com/questions/3631216/how-do-i-get-the-url-of-the-visible-tab-in-firefox-ie-chrome

I did a lot of Googling, and get the following code. The following
code can get the url of the first tab in internet explorer. My
question is, how can I get the url of the current active tab? Thanks.

'''
http://efreedom.com/Question/1-2555905/Get-Internet-Explorer-Address-Bar-Python
http://blogs.msdn.com/b/oldnewthing/archive/2005/07/05/435657.aspx
http://mail.python.org/pipermail/python-win32/2004-June/002040.html
http://code.activestate.com/recipes/302324-browser-automation-tool-py-class-file/
'''
from win32com.client import Dispatch
import win32api, win32con,win32gui


SHELL = Dispatch("Shell.Application")

def get_ie(shell):
    for win in shell.Windows():
#        print win
        if win.Name == "Windows Internet Explorer":
            return win
    return None

def main():
    ie = get_ie(SHELL)
    if ie:
        print ie.LocationURL
        print ie.LocationName
        print ie.ReadyState
        print ie
        print ie.Document.title
        print ie.Document.location
        print ie.Document.forms

#        title = win32gui.GetWindowText(ie)
#        print title

    else:
        print "no ie window"

if __name__ == '__main__':
    main()