diff --git a/hasher.js b/hasher.js
index f9483b4..593874f 100644
--- a/hasher.js
+++ b/hasher.js
@@ -11,11 +11,17 @@ var tabs = {
 };
 
 /*
- *  Copy to clipboard
+ *  Copy to clipboard (Clipboard API with execCommand fallback)
  */
 function copyToClipboard(id) {
-  $("#"+id).select(); 
-  document.execCommand('copy');
+  var el = document.getElementById(id);
+  var text = el ? (el.value || el.textContent || "") : "";
+  if (navigator.clipboard && navigator.clipboard.writeText) {
+    navigator.clipboard.writeText(text);
+  } else {
+    $("#" + id).select();
+    document.execCommand("copy");
+  }
 }
 
 
diff --git a/manifest.json b/manifest.json
index d370b11..14fc4b2 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,19 +1,20 @@
 {
   "name": "Hasher",
-  "version": "1.3.2",
-  "manifest_version": 2,
+  "version": "1.3.3",
+  "manifest_version": 3,
   "description": "Developer's toolbox. Calculates MD5, SHA-1, SHA-2, IP/Subnet, URL decode, Base64 and more",
   "offline_enabled": true,
   "permissions": [
-    "clipboardWrite", "tabs"
+    "clipboardWrite",
+    "tabs"
   ],
-  "browser_action": {
+  "action": {
     "default_icon": "images/icon.png",
     "default_popup": "popup.html"
   },
   "icons": {
-     "16": "images/icon16.png",
-     "48": "images/icon48.png",
+    "16": "images/icon16.png",
+    "48": "images/icon48.png",
     "128": "images/icon128.png"
   }
 }
diff --git a/popup.js b/popup.js
index 36e1685..c325329 100644
--- a/popup.js
+++ b/popup.js
@@ -1,20 +1,8 @@
 $(document).ready(function() {
 
-/*
- * I decided to leave popout button on the popout page
- *
-  if (typeof chrome.extension != "undefined") {
-    if (chrome.extension.getBackgroundPage().separatePopup == true) {
-      $("#popup").hide();
-    } else {
-      $("#popup").show();
-    }
-  }
-*/  
-  
   /*
    * Events registration
-  */
+   */
   $("#input").keyup(function () {
     hasher.update();
   });
@@ -24,18 +12,9 @@ $(document).ready(function() {
 
   // Open separate window (pop-out)
   $("#button-popout").click(function () {
-    if (typeof chrome.extension != "undefined") {
-      //chrome.extension.getBackgroundPage().separatePopup = true;
-/*      
-      chrome.windows.create({
-        url: 'popup.html',
-        type: 'popup',
-        width: 700,
-        height: 800
-      });
-*/      
+    if (typeof chrome.runtime !== "undefined" && chrome.runtime.getURL) {
       chrome.tabs.create({
-        url: 'popup.html'
+        url: chrome.runtime.getURL("popup.html")
       });
     }
   });