Modifying Javascript on-the-fly is Firefox

[Baruch Siach]

Hi Linux-IL members,

I need to interact with web based application at a client location. This 
application suffers from an easy to fix bug in its Javascript source syntax 
that makes the application unusable under Firefox.

Is there any way to run a sed equivalent on the Javascript source before it 
gets parsed by Firefox? Can Greasemonkey do the trick? If so, how?

TIA,
baruch

-- 
                                                     ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -