DevOps, CI/CD and Automation

We're testing a 10g forms/reports application and the forms work fine in both IE and Firefox (Tested 6, 3.5 and 3.0 - same behavior) but when calling a 10g report from a form Firefox just opens a blank tab.
No error message. Doing a View Source on the tab shows no code at all.
The report opens fine (It's a PDF report so it either opens Acrobat within an IE tab, or in an stand-alone Acrobat window, depending on the Acrobat preferences) in Internet Explorer 6,7, and 8 but it's just Firefox where we're having this behavior.

Any ideas?