You could’ve tried it yourself in the time it took you to craft this reply.
It has nothing to do with the browser. Change extension or just save originally as .png instead of .webp
Can pop the file right open in any image editor that can fart with pngs, post directly anywhere else, like Discord.
It’s a differential backup.
Super goddamn common. People who aren’t tech literate should pipedown.
It’s a nothingburger amount of effort to restore backups in most cases lol.