added script

dist/hungergames-brantsteele-webp.user.js

@@ -0,0 +1,21 @@
+// ==UserScript==
+// @name         Hunger Games BrantSteele WebP Support
+// @namespace    zomo.dev
+// @match        https://brantsteele.net/hungergames/edit.php
+// @version      1.0
+// @description  fix the form validator to allow webp images
+// @runat        document-end
+// @downloadURL  https://git.zomo.dev/zomo/browser-scripts/raw/branch/main/dist/hungergames-brantsteele-webp.user.js
+// @supportURL   https://git.zomo.dev/zomo/browser-scripts/issues
+// @homepageURL  https://git.zomo.dev/zomo/browser-scripts
+// ==/UserScript==
+validateForm = Function(
+    validateForm
+        .toString()
+        .replace(/^function validateForm\(\)(.|\n)*?\{/, '')
+        .replace(/\}$/, '')
+        .replaceAll(
+            'var regexp = /(https?:\\/\\/.*\\.(?:png|jpg|gif|bmp|jpeg))$/i',
+            'var regexp = /(https?:\\/\\/.*\\.(?:png|jpg|gif|bmp|jpeg|webp))$/i'
+        )
+)