diff --git a/addthis_displays/addthis_displays.addthis.inc b/addthis_displays/addthis_displays.addthis.inc
index 4c02e84..30aef52 100644
--- a/addthis_displays/addthis_displays.addthis.inc
+++ b/addthis_displays/addthis_displays.addthis.inc
@@ -114,11 +114,10 @@ function addthis_displays_addthis_display_markup__addthis_basic_button($options
   $addthis = AddThis::getInstance();
   $settings = $options['#display']['settings'];
 
-  $button_img = 'http://s7.addthis.com/static/btn/sm-share-en.gif';
+  $button_img = '//s7.addthis.com/static/btn/sm-share-en.gif';
   if (isset($settings['buttons_size']) && $settings['buttons_size'] == 'big') {
-    $button_img = 'http://s7.addthis.com/static/btn/v2/lg-share-en.gif';
+    $button_img = '//s7.addthis.com/static/btn/v2/lg-share-en.gif';
   }
-  $button_img = $addthis->transformToSecureUrl($button_img);
 
   $extra_css = isset($settings['extra_css']) ? $settings['extra_css'] : '';
   $element = array(
diff --git a/classes/AddThis.php b/classes/AddThis.php
index c558a8e..1dc623c 100644
--- a/classes/AddThis.php
+++ b/classes/AddThis.php
@@ -56,10 +56,10 @@ class AddThis {
   const TWITTER_TEMPLATE_DEFAULT = '{{title}} {{url}} via @AddThis';
 
   // External resources.
-  const DEFAULT_BOOKMARK_URL = 'http://www.addthis.com/bookmark.php?v=300';
-  const DEFAULT_SERVICES_CSS_URL = 'http://cache.addthiscdn.com/icons/v1/sprites/services.css';
-  const DEFAULT_SERVICES_JSON_URL = 'http://cache.addthiscdn.com/services/v1/sharing.en.json';
-  const DEFAULT_WIDGET_JS_URL = 'http://s7.addthis.com/js/300/addthis_widget.js';
+  const DEFAULT_BOOKMARK_URL = '//www.addthis.com/bookmark.php?v=300';
+  const DEFAULT_SERVICES_CSS_URL = '//cache.addthiscdn.com/icons/v1/sprites/services.css';
+  const DEFAULT_SERVICES_JSON_URL = '//cache.addthiscdn.com/services/v1/sharing.en.json';
+  const DEFAULT_WIDGET_JS_URL = '//s7.addthis.com/js/300/addthis_widget.js';
   const DEFAULT_WIDGET_JS_LOAD_TYPE = 'async';
 
   // Internal resources.
@@ -211,7 +211,7 @@ class AddThis {
    * Add the AddThis Widget JavaScript to the page.
    */
   public function addWidgetJs() {
-    $widgetjs = new AddThisWidgetJs(self::getWidgetUrl());
+    $widgetjs = new AddThisWidgetJs(self::getBaseWidgetUrl());
     $widgetjs->addAttribute('pubid', $this->getProfileId());
 
     if (self::getWidgetJsLoadType() != 'include') {
@@ -452,11 +452,11 @@ class AddThis {
   }
 
   public function getBaseWidgetJsUrl() {
-    return check_url(variable_get(self::WIDGET_JS_URL_KEY, self::DEFAULT_WIDGET_JS_URL));
+    return variable_get(self::WIDGET_JS_URL_KEY, self::DEFAULT_WIDGET_JS_URL);
   }
 
   public function getBaseBookmarkUrl() {
-    return check_url(variable_get(self::BOOKMARK_URL_KEY, self::DEFAULT_BOOKMARK_URL));
+    return variable_get(self::BOOKMARK_URL_KEY, self::DEFAULT_BOOKMARK_URL);
   }
 
   public function getCoBrand() {
@@ -552,18 +552,16 @@ class AddThis {
 
   /**
    * Get the url for the AddThis Widget.
+   * @deprecated
    */
   private function getWidgetUrl() {
-    $url = ($this->currentlyOnHttps() ?
-      $this->getBaseWidgetJsUrl() : // Not https url.
-      $this->transformToSecureUrl($this->getBaseWidgetJsUrl()) // Transformed to https url.
-    );
-    return check_url($url);
+    return $this->getBaseWidgetJsUrl();
   }
 
   /**
    * Request if we are currently on a https connection.
    *
+   * @deprecated No longer used.
    * @return True if we are currently on a https connection.
    */
   public function currentlyOnHttps() {
@@ -573,6 +571,8 @@ class AddThis {
 
   /**
    * Transform a url to secure url with https prefix.
+   *
+   * @deprecated No longer used.
    */
   public function transformToSecureUrl($url) {
     if ($this->currentlyOnHttps()) {