playwright/docs/src/chrome-extensions.md

id	title
chrome-extensions	Chrome Extensions

:::note Extensions only work in Chrome / Chromium in non-headless mode. :::

The following is code for getting a handle to the background page of an extension whose source is located in ./my-extension:

const { chromium } = require('playwright');

(async () => {
  const pathToExtension = require('path').join(__dirname, 'my-extension');
  const userDataDir = '/tmp/test-user-data-dir';
  const browserContext = await chromium.launchPersistentContext(userDataDir,{
    headless: false,
    args: [
      `--disable-extensions-except=${pathToExtension}`,
      `--load-extension=${pathToExtension}`
    ]
  });
  const backgroundPage = browserContext.backgroundPages()[0];
  // Test the background page as you would any other page.
  await browserContext.close();
})();