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How are firefox download pause and resume features implemented? A high-level logic/algorithm would be greatly appreciated.

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I would like to write a stand-alone program (supporting the pause and resume features) to download stuff from internet. Can someone provide info how this can be done?

I would like to write a stand-alone program (supporting the pause and resume features) to download stuff from internet. Can someone provide info how this can be done?

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Sorry that is beyond the scope of this Firefox user support forum.
https://developer.mozilla.org/en-US/