Today Microsoft released a new Windows 10 insider Preview build 17692. After updating to this build you will be able to automatically download the WebP Extension for Microsoft Edge. This means Microsoft Edge now supports the Google Image format called WebP. WebP is Google’s alternative smaller image format to that of JPEGs or PNGs.
This is still only present in the Windows 10 preview builds and it looks like it will be available in the next Windows 10 update later this year.