I was trying to debug an ASPX page today on FireFox to see what was going on. I usually use Fiddler to do this especially when I want to know what is being send/received. I wanted to debug on FireFox however, I noticed that Fiddler doesn't work on Firefox without some configuration settings.
Please check this URL to see how to enable Fiddler on FireFox:
http://nil.checksite.co.uk/index.cfm/2006/4/12/Using-Fiddler-with-Firefox
Hope this helps,
Regards
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