Missed purchased downloads because the add-on does not store start-end parameters in non-volatile location - i.e. if Firefox is closed, the download time window reverts to 0-5 (midnight to 5:00 AM). I reset download window to occur between 2:00 AM and 7:00 AM - my allowable download window from Hughesnet - and because the saved Start Hour/End-Hour are reset if Firefox is closed then re-opened, paused downloads are not resumed during the expected time period. I do not leave Web apps - including Firefox - open unless I am using them (for security reasons). This rating is only because the add-on was of no use to me in my situation - it may be fine for those who keep Firefox open all night. If "review guidelines" is opened when editing - it is not obvious how to return to your review - on a different note.