diff --git a/src/drivers/npm/README.md b/src/drivers/npm/README.md
index 29078d2f3..3214b693c 100644
--- a/src/drivers/npm/README.md
+++ b/src/drivers/npm/README.md
@@ -49,6 +49,8 @@ node index.js [url] [options]
 const Wappalyzer = require('./driver');
 const Browser = require('./browsers/zombie');
 
+const url = 'https://www.wappalyzer.com;
+
 const options = {
   debug: false,
   delay: 500,
@@ -61,10 +63,17 @@ const options = {
   htmlMaxRows: 2000,
 };
 
-const wappalyzer = new Wappalyzer(Browser, 'https://www.wappalyzer.com', options);
+const wappalyzer = new Wappalyzer(Browser, url, options);
+
+// Optional: capture log output
+// wappalyzer.on('log', params => {
+//   const { message, source, type } = params;
+// });
 
-// Optionally override the default logger
-// wappalyzer.log = (message, source, type) => console.log(message);
+// Optional: do something on page visit
+// wappalyzer.on('visit', params => {
+//   const { browser, pageUrl } = params;
+// });
 
 wappalyzer.analyze()
   .then(json => {
diff --git a/src/drivers/npm/browsers/zombie.js b/src/drivers/npm/browsers/zombie.js
index 0e091d697..28f6ba3ce 100644
--- a/src/drivers/npm/browsers/zombie.js
+++ b/src/drivers/npm/browsers/zombie.js
@@ -25,6 +25,8 @@ class ZombieBrowser extends Browser {
         const resource = this.browser.resources.length
           ? this.browser.resources.filter(_resource => _resource.response).shift() : null;
 
+        this.window = this.browser.window;
+        this.document = this.browser.document;
         this.headers = this.getHeaders();
         this.statusCode = resource ? resource.response.status : 0;
         this.contentType = this.headers['content-type'] ? this.headers['content-type'].shift() : null;
diff --git a/src/drivers/npm/driver.js b/src/drivers/npm/driver.js
index cf4bfce61..53746b326 100644
--- a/src/drivers/npm/driver.js
+++ b/src/drivers/npm/driver.js
@@ -48,6 +48,7 @@ class Driver {
     this.analyzedPageUrls = {};
     this.apps = [];
     this.meta = {};
+    this.listeners = {};
 
     this.Browser = Browser;
 
@@ -65,6 +66,20 @@ class Driver {
     process.on('uncaughtException', e => this.wappalyzer.log(`Uncaught exception: ${e.message}`, 'driver', 'error'));
   }
 
+  on(event, callback) {
+    if (!this.listeners[event]) {
+      this.listeners[event] = [];
+    }
+
+    this.listeners[event].push(callback);
+  }
+
+  emit(event, params) {
+    if (this.listeners[event]) {
+      this.listeners[event].forEach(listener => listener(params));
+    }
+  }
+
   analyze() {
     this.time = {
       start: new Date().getTime(),
@@ -78,6 +93,8 @@ class Driver {
     if (this.options.debug) {
       console.log(`[wappalyzer ${type}]`, `[${source}]`, message);
     }
+
+    this.emit('log', { message, source, type });
   }
 
   displayApps(detected, meta) {
@@ -150,11 +167,11 @@ class Driver {
 
     // Validate response
     if (!browser.statusCode) {
-      reject(new Error('NO_RESPONSE'));
+      return reject(new Error('NO_RESPONSE'));
     }
 
     if (browser.statusCode !== 200) {
-      reject(new Error('RESPONSE_NOT_OK'));
+      return reject(new Error('RESPONSE_NOT_OK'));
     }
 
     if (!browser.contentType || !/\btext\/html\b/.test(browser.contentType)) {
@@ -188,6 +205,8 @@ class Driver {
       }, [],
     );
 
+    this.emit('visit', { browser, pageUrl });
+
     return resolve(reducedLinks);
   }
 
diff --git a/src/drivers/npm/npm-shrinkwrap.json b/src/drivers/npm/npm-shrinkwrap.json
index 0152d40c4..238a9bf90 100644
--- a/src/drivers/npm/npm-shrinkwrap.json
+++ b/src/drivers/npm/npm-shrinkwrap.json
@@ -1,6 +1,6 @@
 {
   "name": "wappalyzer",
-  "version": "5.6.0",
+  "version": "5.6.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/src/drivers/npm/package.json b/src/drivers/npm/package.json
index 0067fa0d5..14a7c6645 100644
--- a/src/drivers/npm/package.json
+++ b/src/drivers/npm/package.json
@@ -2,7 +2,7 @@
   "name": "wappalyzer",
   "description": "Uncovers the technologies used on websites",
   "homepage": "https://github.com/AliasIO/Wappalyzer",
-  "version": "5.6.1",
+  "version": "5.6.2",
   "author": "Elbert Alias",
   "license": "GPL-3.0",
   "repository": {
@@ -12,9 +12,10 @@
   "main": "driver.js",
   "files": [
     "apps.json",
+    "browser.js",
     "browsers/zombie.js",
-    "index.js",
     "driver.js",
+    "index.js",
     "wappalyzer.js"
   ],
   "bin": {
diff --git a/src/drivers/webextension/js/driver.js b/src/drivers/webextension/js/driver.js
index 1336809d4..c1703ed5c 100644
--- a/src/drivers/webextension/js/driver.js
+++ b/src/drivers/webextension/js/driver.js
@@ -339,8 +339,8 @@ wappalyzer.driver.ping = async (hostnameCache = {}, adCache = []) => {
     });
   } else if (version !== previousVersion && upgradeMessage) {
     openTab({
-     url: `${wappalyzer.config.websiteURL}upgraded?v${version}`,
-     background: true,
+      url: `${wappalyzer.config.websiteURL}upgraded?v${version}`,
+      background: true,
     });
   }
 
diff --git a/src/drivers/webextension/manifest.json b/src/drivers/webextension/manifest.json
index bb1146b10..3f12953c8 100644
--- a/src/drivers/webextension/manifest.json
+++ b/src/drivers/webextension/manifest.json
@@ -4,7 +4,7 @@
   "author": "Elbert Alias",
   "homepage_url": "https://www.wappalyzer.com",
   "description": "Identify web technologies",
-  "version": "5.6.1",
+  "version": "5.6.2",
   "default_locale": "en",
   "manifest_version": 2,
   "icons": {