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i can't download firefox, it ask enter S/N, i don't know what is S/N

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ask enter S/N but i don't know what is S/N?

This happened

Not sure how often

today

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

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Where are you trying to download Firefox from?

Mozilla doesn't require users to enter a serial number for downloading Firefox.

You can download Firefox from these URLs. http://www.mozilla.com/en-US/firefox/ or http://www.mozilla.com/en-US/firefox/all.html