Fine volume control (1% under 10%) and add credits

popup.html

@@ -33,7 +33,7 @@
 
     <!-- Slider -->
     <div class="slider-wrap">
-      <input type="range" id="slider" min="0" max="600" step="10" value="100" />
+      <input type="range" id="slider" min="0" max="600" step="1" value="100" />
       <div class="ticks">
         <span>0</span><span>100</span><span>300</span><span>600</span>
       </div>
@@ -87,6 +87,11 @@
     <!-- Fußzeile / Hinweis -->
     <p class="note" id="note">Über 100 % wird der Tab-Ton verstärkt.</p>
 
+    <!-- Credits -->
+    <footer class="credits">
+      Made by Tronax with <span class="heart" aria-label="love">♥</span>
+    </footer>
+
   </div>
   <script src="popup.js"></script>
 </body>