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

assets/js/options.js

@@ -0,0 +1,44 @@
+/* This is a fix for Bootstrap requiring jQuery */
+global.jQuery = require('jquery');
+require('bootstrap');
+
+// Saves options to chrome.storage.sync.
+function save_options(e) {
+  e.preventDefault();
+
+  var theme = document.getElementById('theme').value;
+  var blacklist = document.getElementById('blacklist').value;
+
+  chrome.storage.sync.set({
+    theme: theme,
+    blacklist: blacklist
+  }, function() {
+    // Update status to let user know options were saved.
+    var status = document.getElementById('status');
+    status.style.display = 'block';
+    status.innerHTML = '<strong>Well done!</strong> Options have been saved.';
+
+    //TODO: This is a nice place for fade in and fade out...
+    
+    setTimeout(function() {
+      status.textContent = '';
+      status.style.display = 'none';
+    }, 1500);
+  });
+}
+
+// Restores select box and checkbox state using the preferences
+// stored in chrome.storage.
+function restore_options() {
+  // Use default value color = 'red' and likesColor = true.
+  chrome.storage.sync.get({
+    theme: 'light',
+    blacklist: ''
+  }, function(items) {
+    document.getElementById('theme').value = items.theme;
+    document.getElementById('blacklist').value = items.blacklist;
+  });
+}
+
+document.addEventListener('DOMContentLoaded', restore_options);
+document.getElementById('save').addEventListener('click', save_options);