added files via upload

Extensions/OpenYoutubeSafariExtension.appex/content.js

@@ -0,0 +1,25 @@
+browser.runtime.sendMessage({ greeting: "hello" }).then((response) => {
+    console.log("Received response: ", response);
+});
+
+browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
+    console.log("Received request: ", request);
+});
+
+function afterNavigate() {
+    if ('/watch' === location.pathname) {
+        window.location.href = `youtube://${window.location.pathname.slice(1)}${
+            window.location.search
+        }${window.location.hash}`;
+    }
+}
+(document.body || document.documentElement).addEventListener('transitionend',
+  function(/*TransitionEvent*/ event) {
+    if (event.propertyName === 'width' && event.target.id === 'progress') {
+        afterNavigate();
+    }
+}, true);
+// After page load
+afterNavigate();
+
+