diff --git a/index.js b/index.js
index 746525753e19878c0d4711e023e02a77eb5ecf8a..a5c323eb19311235df43c5ae9e0025b7bd1da25d 100644
--- a/index.js
+++ b/index.js
@@ -21,6 +21,7 @@ const { PuppeteerExtraPlugin } = require('puppeteer-extra-plugin')
  * )
  * const browser = await puppeteer.launch()
  */
+
 class Plugin extends PuppeteerExtraPlugin {
   constructor(opts = {}) {
     super(opts)
@@ -38,7 +39,7 @@ class Plugin extends PuppeteerExtraPlugin {
     }
   }
 
-  async onPageCreated(page) {
+  async handler (page) {
     let ua = await page.browser().userAgent()
     if (this.opts.stripHeadless) {
       ua = ua.replace('HeadlessChrome/', 'Chrome/')
@@ -52,6 +53,17 @@ class Plugin extends PuppeteerExtraPlugin {
     this.debug('new ua', ua)
     await page.setUserAgent(ua)
   }
+
+  async onBrowser(browser) {
+    const pages = await browser.pages()
+    for (const page of pages) {
+      await this.handler(page)
+    }
+  }
+
+  async onPageCreated(page) {
+    await this.handler(page)
+  }
 }
 
 module.exports = function(pluginConfig) {