diff --git a/background.js b/background.js
index d0da240..8b65cee 100755
--- a/background.js
+++ b/background.js
@@ -11,9 +11,9 @@ chrome.pageAction.onClicked.addListener(function (tab) {
   var path = tab.url.split('//');
   var username = path[1].split('/')[1];
   var repo = path[1].split('/')[2];
-  var hackernotesUrl = "http://hackernotes.org/" + username + '/' + repo;
+  var hackernotesUrl = "http://www.hackernotes.org/" + username + '/' + repo;
   if(username === "" || repo === "") {
-    hackernotesUrl = "http://hackernotes.org/"
+    hackernotesUrl = "http://www.hackernotes.org/"
   }
   chrome.tabs.create({
     url: hackernotesUrl
diff --git a/icon-128.jpg b/icon-128.jpg
deleted file mode 100755
index e113793..0000000
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diff --git a/icon-128.png b/icon-128.png
new file mode 100644
index 0000000..03697ba
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diff --git a/icon-16.jpg b/icon-16.jpg
deleted file mode 100755
index 11ac359..0000000
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diff --git a/icon-16.png b/icon-16.png
new file mode 100644
index 0000000..ae73717
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diff --git a/icon-48.jpg b/icon-48.jpg
deleted file mode 100755
index 76e9655..0000000
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diff --git a/icon-48.png b/icon-48.png
new file mode 100644
index 0000000..4317bf8
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diff --git a/manifest.json b/manifest.json
index c0d82bc..c1c9c17 100755
--- a/manifest.json
+++ b/manifest.json
@@ -5,15 +5,15 @@
   "background": { "scripts": ["background.js"] },
   "page_action" :
   {
-    "default_icon" : "icon-16.jpg",
+    "default_icon" : "icon-16.png",
     "default_title" : "HackerNotes"
   },
   "permissions" : [
     "tabs"
   ],
   "icons" : {
-    "48" : "icon-48.jpg",
-    "128" : "icon-128.jpg"
+    "48" : "icon-48.png",
+    "128" : "icon-128.png"
   },
   "manifest_version": 2
 }