title: Close all puppeteer browsers
body: <p>Is it possible to close all running puppeteer browsers using some block of code?
  I have opened more browsers using for loop and I want to stop them before exiting the process using <code>process.exit()</code>.</p>
  <p>I would like to to clear temporary files of the browsers (cached and others), I am starting browsers using
  <code>const browser = await puppeteer.launch({ headless: true, args: ['--no-sandbox', '--disable-setuid-sandbox', '--disable-features=site-per-process',  '--proxy-server=proxy_url'] });</code>.</p>