New icon that looks a bit better on a Retina Mac running Chrome...

src/chrome/background.html

@@ -11,7 +11,7 @@
                     !tab.url.indexOf('chrome-extension://')) {
                     alert('For security reasons Chrome extensions cannot ' +
                         'run content scripts at this page.');
-                    
+
                     return;
                 }
                 chrome.windows.create({
@@ -23,6 +23,12 @@
                     type: 'popup'
                 });
             });
+            chrome.browserAction.setIcon({
+                path: {
+                    "19": "icon19x19.png",
+                    "38": "[email protected]"
+                }
+            });
         </script>
     </body>
 </html>

src/chrome/manifest.json

@@ -10,26 +10,27 @@
     },
     "browser_action": {
         "name": "YSlow",
-        "default_icon": "icon.png"
+        "default_icon": {
+            "19": "icon38x19.png",
+            "38": "[email protected]"
+        },
     },
     "background_page": "background.html",
     "options_page": "options.html",
-    "content_scripts": [
-        {
-            "matches": [
-                "http://*/*",
-                "https://*/*"
-            ],
-            "js": [
-                "content.js",
-                "yslow-chrome.js"
-            ]
-        }
-    ],
+    "content_scripts": [{
+        "matches": [
+            "http://*/*",
+            "https://*/*"
+        ],
+        "js": [
+            "content.js",
+            "yslow-chrome.js"
+        ]
+    }],
     "permissions": [
         "tabs",
         "cookies",
         "http://*/*",
         "https://*/*"
     ]
-}
+}