When I try to download a Image from Facebook or ANY other pages, it works but is not optimized as other versions. Google and Other Pages
In pages like google it do not give you a file extention so you will have to enter it manually, if you skip that step, you will ended up in an useless file, not able to be open by any program, unless you give it a image file format (.jpg / .png / .gif ,etc)
Facebook
In facebook it will give you a code after the file extension (.jpg / .p