Thanks for the feedback.
Please keep in mind that i have no insight into what users of my addons use until they decide to post about it here. The png option was removed in favour of reducing the required permissons and keeping the addon small and maintainable. My reasoning was that the options was not a essential function to fullfill what the addon sets out to do which is saving full website snapshots. The decision which format to use was simply done by observing that generally the processing of jpeg was faster than png likely because of their smaller in memory footprint. Since people nowadays are always in a hurry it seemed more important to cater to this rather than on pixel accuracy. When i get feedback from more users i might consider to re-add the option, but for now i'd suggest that you continue to use the old version if that fully covered your requirments.