Shortly I tested some different stock watch program.
All of them open reports as html-files.
With my favorit computer / portable-FF on HD I got some problems
If the portable FF is running I always have a error message
"Another instance of firefox is allready running..."
If I dont have a running FF the local instance will start.
And if the local FF is running the reports opens in new TABs
Cause my protable FF is running all the time I have to find a solution for this problem.