Noscript image conversion to WEBP breaks functionality for me on Firefox

In Version 13.5.12 Noscript now converts images to WEBP. That is a problem for me because I detest WEBP. So much so that I have disabled WEBP entirely in the Firefox config menu in order to force websites to display the original JPG or PNG images. That way I can download the original high quality image if I want to and not have to convert it from WEBP to PNG.