Should work now, was trying to get to the bottom of a bug that I was experiencing, others should be just fine. If this update still doesnt work for you, it is a bug within firefox. Note that I developed the same extension for chrome that definitely works utilizing the same API. You can search for "auto-resume downloads" in the add on store, it also can be found at this url: https://chrome.google.com/webstore/detail/auto-resume-downloads/cklhieaaomjcmlaeopmeidpfdjjogjaf