[Pythonmac-SIG] appscript and Firefox

[Bill Janssen]

I'm finally trying to learn appscript, and I thought I'd write a
little system monitor that goes around to my various open applications
and logs what files/URLs I'm looking at.  For Safari, this is easy:

  print app('Safari').windows.first.current_tab.URL()

but I can't figure out how to get the current URL for Firefox.
There's a bug report at
https://bugzilla.mozilla.org/show_bug.cgi?id=427448 which seems to
show that you can get the URL with the applescript fragment

  set url to get <<class curl>> of window 1 as text

at least for older versions of Firefox.

But how do I write "<<class curl>>" in appscript?

Bill