ColdFusion reports fail in Apple

I have a simple CFM page that calls a simple CFR file that all users can generate and view, except one user who is on an Apple Mac and using Firefox. Instead of getting the report, the browser downloads the CFM page to her desktop. what could be causing this? The report works fine in Firefox and IE on a Windows PC. (I tried to get the Mac user to test in IE on her Mac, but her IE won't open and keeps crashing.)

The main calling page has a button with a onClick script that runs JavaScript with this command:
var newWin = window.open('FeedbackReportsGenerate.cfm', 'newWin');
This is done to get the report to open in a new window as opposed to taking over the main calling page window.

The FeedbackReportsGenerate.cfm file then has this code:

<cfreport template="EFETAC_FeedbackSummary.cfr" format="pdf" >
<cfreportparam name="dsn" value="ENC_Threats">
</cfreport>

The FeedbackReportsGenerate.cfm page doesn't open on the Mac - instead this is the file downloaded to the user desktop. The report does not run at all.

Any ideas? Thanks
Todd Pierce
NEMAC
University of North Carolina-Asheville
tpierce@unca.edu