Kinda worries me when there's a typo in the headline of a tech article.

Wow, a whopping four people in "recent months" in a city of over 800,000? Totally running rampant.

Here's a Firefox extension that adds right-click context menu options to save the webp as PNG or JPEG:
https://addons.mozilla.org/en-US/firefox/addon/save-webp-as-png-or-jpeg/
and its GitHub page:
https://github.com/jscher2000/Save-webP-as-extension

Makes it a bit easier than downloading the webp and converting it.