Added options with blacklist and theme. Created a function for changing the extension icon color.

assets/js/helpers/changeExtensionIcon.js

@@ -0,0 +1,34 @@
+/**
+ * It changes the extension icon color.
+ * Supported values are: 'red', 'white' and ''.
+ *
+ * @param  string color = ''
+ * @return null
+ */
+export default function changeExtensionIcon(color = '') {
+
+    var canvas = document.getElementById('icon');
+    var context = canvas.getContext('2d');
+
+    var x = 0;
+    var y = 0;
+    var width = 19;
+    var height = 19;
+    var imageObj = new Image();
+
+    imageObj.onload = function() {
+      context.drawImage(imageObj, x, y, width, height);
+
+      var imageData = context.getImageData(x, y, width, height);
+
+      chrome.browserAction.setIcon({
+          imageData: imageData
+      });
+    };
+
+    if(color !== ''){
+        color = '-' + color;
+    }
+
+    imageObj.src = 'graphics/wakatime-logo-48' + color + '.png';
+}