Without a doubt, it is the best extension for downloading images in Firefox, although there are not so many available. The good thing is that the configuration options cover all the possibilities of tracking and saving, or at least all the ones that I tested, and the filters are updated in real time of click. On the negative side, only the gallery section, which still lacks buttons for sorting type and size, a quantity display of selected items and, mainly, a method of selecting by clicking on the thumbnails instead of the check boxes, which are tiny and make operations with a lot of clicks very tiring.