The first post of this thread that provides the script and text for the custom action works like a champ on Windows 7 Business and Vista Business machines on a Windows 2003 domain.
Thanks for your work on this!
//Update:
Just for clarification...I put the script in my Actions directory on the LS server and used the exact action text provided. I then ran the action via FireFox 3.6.8 from a Windows 7 computer connected over VPN on a different VLAN. NO PROBLEMS. WORKED GREAT!
Not sure why others are having problems??? But this was 2 years ago so perhaps its working for them now.
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