How does Firefox download manager work?

I was wondering how Firefox Downloads work? Does it use a differnet port? I have wifi at college which is controlled by proxy with username and password. The internet connection is set to cut off at 10:00 PM. But strangely, if we have a download going on Firefox, not any external download managers, the download will carry on even after 10:00pm, which I cannot browse anymore. My friend could download very large file throughout the night, even though we couldn't browse internet.
Can someone explain why this happens?

If you are talking about 3.6 versions, Please read this thread and follow TonyE instructions:
https://support.mozilla.com/en-US/questions/815246

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