Apple Script - get the current browser URL

get_browser_url.as

tell application "System Events"
	set myApp to name of first application process whose frontmost is true
	if myApp is "Google Chrome" then
		tell application "Google Chrome" to return URL of active tab of front window
	else if myApp is "Opera" then
		tell application "Opera" to return URL of front document
	else if myApp is "Safari" then
		tell application "Safari" to return URL of front document
	else if myApp is "Firefox" then
		tell application "System Events"
			keystroke "l" using command down
			keystroke "c" using command down
		end tell
		delay 0.5
		return the clipboard
	else
		return
	end if
end tell