First Commit, Code by Claude 4.7 Opus

popup.js

@@ -0,0 +1,38 @@
+const slider  = document.getElementById('slider');
+const display = document.getElementById('display');
+const reset   = document.getElementById('reset');
+
+// Gespeicherten Wert laden
+chrome.storage.local.get('volume', ({ volume }) => {
+    const val = volume ?? 100;
+    slider.value = val;
+    display.textContent = val;
+});
+
+// Schieberegler bewegen
+slider.addEventListener('input', () => {
+    const val = parseInt(slider.value);
+    display.textContent = val;
+    chrome.storage.local.set({ volume: val });
+
+    // Aktiven Tab anweisen
+    chrome.tabs.query(
+        { active: true, currentWindow: true },
+        ([tab]) => {
+            chrome.tabs.sendMessage(tab.id, { volume: val });
+        }
+    );
+});
+
+// Zurücksetzen auf 100%
+reset.addEventListener('click', () => {
+    slider.value = 100;
+    display.textContent = 100;
+    chrome.storage.local.set({ volume: 100 });
+    chrome.tabs.query(
+        { active: true, currentWindow: true },
+        ([tab]) => {
+            chrome.tabs.sendMessage(tab.id, { volume: 100 });
+        }
+    );
+});