Convert extension to manifest v3. Still under testing

offscreen/offscreen.html

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+<!doctype html>
+<textarea id="text"></textarea>
+<script src="offscreen.js"></script>

offscreen/offscreen.js

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+/**
+ * COPYRIGHT NOTICE
+ * THIS FILE WAS INSPIRED FROM: https://github.com/GoogleChrome/chrome-extensions-samples/tree/main/functional-samples/cookbook.offscreen-clipboard-write
+ * THE BASE CODE IS LICENSED UNDER THE APACHE 2 LICENSE
+ * (https://www.apache.org/licenses/LICENSE-2.0)
+ */
+
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ * COPYRIGHT NOTICE
+ * ALL PERSONAL **MODIFICATIONS** ARE LICENSED UNDER THE GNU GENEARL PUBLIC LICENSE VERSION 3
+ * YOU MAY FIND THIS LICENSE IN THE "LICENSE.md" FILE.
+ * IF NOT, SEE https://www.gnu.org/licenses
+ * */
+
+/*
+ * An unofficial extension for easy link shortening using the Chhoto URL API.
+ * Copyright (C) 2025 Solomon Tech
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+// Get element
+const textEle = document.querySelector("#text");
+
+// Function which actually copies the link
+async function copy(link) {
+  try {
+    // If the link is not a string
+    if (typeof link !== 'string') {
+      // Return an error
+      throw new TypeError(`The shortened URL's type must be a 'string', not "${typeof link}"`);
+    }
+
+    // Set the value of the text element
+    textEle.value = link;
+
+    // Select the element
+    textEle.select();
+
+    // Copy to the clipboard
+    document.execCommand('copy');
+  } finally {
+    // Close the offscreen document
+    window.close();
+  }
+};
+
+// Ensures the message was meant for this message handler
+async function handleMessages(message) {
+  // Only activate if the received message was intended for the offscreen handler
+  if (message.type === 'clipboard') {
+    // Call the copy function and pass the link
+    copy(message.link);
+  } else {
+    // Return, if the message wasn't intended for the offscreen handler
+    return;
+  };
+};
+
+// Listen for runtime messages
+chrome.runtime.onMessage.addListener(handleMessages);