Dear @firefox : Please stop saving images as webp when I drag them out of the browser. Forever stop that. Even if they are webp originally, just give me a setting to auto-convert them to JPEG. When I get a webp file the first thing I have to do is convert it manually if I’m going to do *anything* with it.
I also find this insulting even as a linux user myself.
OP you can try GIMP in the meantime as Firefox exports WEBP. There is also a portable version by PortableApps.
Have a nice day, OP.