WebP image support for Firefox

scripts/Utils/supportsWebP.ts

@@ -0,0 +1,9 @@
+export async function supportsWebP(): Promise<boolean> {
+	if(!window.createImageBitmap) {
+		return false
+	}
+
+	const data = "data:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAAAAAAfQ//73v/+BiOh/AAA="
+	const blob = await fetch(data).then(r => r.blob())
+	return createImageBitmap(blob).then(() => true, () => false)
+}