Silent anger*
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.webp? Oh great, I get to install Homebrew, search for some package to convert it into a PNG, figure out the command line options and then finally I'll get an usable version of the image.
In case you're actually wondering, its:
brew install webp dwebp {filename}.webp -o {filename}.png
1.) Download the webp image
2.) Open using paint
3.) Save as png
Just tested it, and the latest versions of macOS and iOS can both display WebP images.