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How do firefox react to HTTP status codes and HTTP headers

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I'm trying to understand how this browser reacts to HTTP status codes, for example. If it has predefined error pages like IE and how was it programmed to react to each of the HTTP status codes (and, if possible the most usual headers)

This happened

Every time Firefox opened

== Not Applicable

I'm trying to understand how this browser reacts to HTTP status codes, for example. If it has predefined error pages like IE and how was it programmed to react to each of the HTTP status codes (and, if possible the most usual headers) == This happened == Every time Firefox opened == Not Applicable

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Can you explain how this is an end user support question?