diff --git a/gatsby-config.js b/gatsby-config.js
index e87e61a..db5c429 100644
--- a/gatsby-config.js
+++ b/gatsby-config.js
@@ -65,9 +65,12 @@ module.exports = {
         ignore: ['prismjs/','docsearch.js/', 'src/theme/assets/search/algolia.css'],
         //purgeOnly : ['components/', '/main.css', 'bootstrap/'],
       }
-    }        
-    // this (optional) plugin enables Progressive Web App + Offline functionality
-    // To learn more, visit: https://gatsby.dev/offline
-    // `gatsby-plugin-offline`,
+    },
+    {
+      resolve: `gatsby-plugin-offline`,
+      options: {
+        precachePages: [`/en/4/developer_guides/*`],
+      },      
+    }   
   ],
 }
diff --git a/gatsby-ssr.js b/gatsby-ssr.js
index 254f84a..02ea649 100644
--- a/gatsby-ssr.js
+++ b/gatsby-ssr.js
@@ -8,7 +8,7 @@ exports.wrapPageElement = ({ element, props }) => {
 exports.onRenderBody = ({ setPostBodyComponents }) => {
     setPostBodyComponents([
     <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js" />,
-    <script dangerouslySetInnerHTML={{
+    process.env.NODE_ENV === 'production' && <script dangerouslySetInnerHTML={{
         __html: `
 		(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
             (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),