It's a good extension, it downloads orginal size image with Double-click, but it downloads image with random name & without extension (.webp, .jpg, etc). The image that is hyper-link too, you can right-click on image to download it, what it needs is to download image with page title name & with extension (.webp, .jpg, etc).
Filenames and extensions depend entirely on the hosting server. Renaming using a.o. the page title is implemented but not supported by firefox itself. Thank you for the reasonable rating, all things considered, unlike the way some people rate projects.
