diff --git a/js/extensionMgr.js b/js/extensionMgr.js
index 2490ecd0..7fad431a 100644
--- a/js/extensionMgr.js
+++ b/js/extensionMgr.js
@@ -10,6 +10,7 @@ define([
     "extensions/buttonShare",
     "extensions/buttonStat",
     "extensions/buttonHtmlCode",
+    "extensions/buttonViewer",
     "extensions/dialogAbout",
     "extensions/dialogManagePublication",
     "extensions/dialogManageSynchronization",
diff --git a/js/extensions/buttonViewer.js b/js/extensions/buttonViewer.js
new file mode 100644
index 00000000..ae2e7d5d
--- /dev/null
+++ b/js/extensions/buttonViewer.js
@@ -0,0 +1,19 @@
+define([
+    "jquery",
+    "text!html/buttonViewer.html",
+], function($, buttonViewerHTML) {
+
+    var buttonViewer = {
+        extensionId: "buttonViewer",
+        extensionName: 'Button "Viewer"',
+        optional: true,
+        settingsBloc: '<p>Adds a "Viewer" button over the preview.</p>'
+    };
+
+    buttonViewer.onCreatePreviewButton = function() {
+        return $(buttonViewerHTML);
+    };
+
+    return buttonViewer;
+
+});
\ No newline at end of file
diff --git a/js/html/buttonViewer.html b/js/html/buttonViewer.html
new file mode 100644
index 00000000..7bd8ee1e
--- /dev/null
+++ b/js/html/buttonViewer.html
@@ -0,0 +1,4 @@
+<a href="viewer.html" class="btn dropdown-toggle"
+	title="Open in viewer">
+	<i class="icon-fullscreen"></i>
+</a>
diff --git a/js/synchronizer.js b/js/synchronizer.js
index 83ce581b..a9ff9f40 100644
--- a/js/synchronizer.js
+++ b/js/synchronizer.js
@@ -61,7 +61,6 @@ define([
 
         // Dequeue a synchronized location
         var syncAttributes = uploadSyncAttributesList.pop();
-        utils.logValue(syncAttributes.syncIndex + localStorage[syncAttributes.syncIndex]);
 
         // Use the specified provider to perform the upload
         syncAttributes.provider.syncUp(uploadContent, uploadContentCRC, uploadTitle, uploadTitleCRC, syncAttributes, function(error, uploadFlag) {