index.js

const playwright = require('playwright');

(async () => {
  for (const browserType of ['chromium', 'firefox']) { // 'webkit' is also supported, but there is a problem on Linux
    const browser = await playwright[browserType].launch();
    const context = await browser.newContext();
    const page = await context.newPage();
    await page.goto('https://httpbin.org/headers');
    console.log(await page.locator('pre').textContent());
    await browser.close();
  }
})();

// "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/94.0.4595.0 Safari/537.36",
// "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0",