It's almost perfect. Almost. I tried downloading 12 image pertaining a video game walkthrough. This add-on spawned 12 "Save as..." dialog boxes. (I know a competing add-on that doesn't do this. It asks for the saving path in advance.) It's video-saving function is also handy; it performs a couple of things better than its competitors. But ultimately, you'd need external apps to deal with downloaded videos, such as FFmpeg, MKVToolNix, or XMedia Recode. (One of these three is fine.)