Install it from here: https://chromewebstore.google.com/detail/save-webp-as-jpgpng/dehibjkjchkomncipegajplehmgpodjn
WebP is a format created by Google to make image load, on web pages, less costly and sizeable. That format can, however, be a nuissance to deal with in various image editing software.
Converts .webp images to either a JPG or PNG upon requesting it and allows you to save it, as you would any other image.
Select which format you want to convert .webp images in (that option is saved through every session)
Right-click the image and select "Save Image As..." on the bottom
Open an issue here or leave it as a comment/review on the Chrome extension's page