Very handy extension, simple and effective - use it a lot. Even though there's a warning about a Firefox bug, would suggest to add %datetime% to renaming pattern options. Of course, if suggestion is accepted, ISO format should be preferred (yyyy-mm-dd_hh.mm.ss). Compliments to author.
Sorry for the late reply, glad you like it, thanks. I like your idea, please follow progress here: https://gitlab.com/Marnes/doubleclick-image-downloader/issues/71
