choose browser output when debugging

Hi,
I'd like to output debug in firefox instead of iexplorer. I
try to
change that in window menu => web browser => firefox
with no success.

I can see that browser output view is iexplorer by right
clicking
inside it and recognizing iexplorer contextual menu.

Otherwise is it possible to change HTTP headers sent to the
web server
(I need to customize some informations like the 'user
agent')

Best Regards
-- 
Yann.
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