How to load a Chrome Extension url

Ok this worked for me! How exciting

const puppeteer = require('puppeteer');

(async () => {

  const args = puppeteer.defaultArgs().filter(arg => String(arg).toLowerCase() !== '--disable-extensions');

  const browser = await puppeteer.launch({
    headless: false,
    devtools: true,
    ignoreDefaultArgs: true,
    args: args.concat([
      '--remote-debugging-port=9223',
      '--load-extension=/Users/alexamil/WebstormProjects/oresoftware/sumanjs/suman-chrome-extension'
      ]
    )
  });
  
  const c = await puppeteer.connect({
    browserWSEndpoint:  browser.wsEndpoint() ,   //`ws://${host}:${port}/devtools/browser/<id>`,
    ignoreHTTPSErrors: false
  });

  const page = await c.newPage();
  await page.goto('chrome-extension://hfnplgaapcnjblpebnhibfcdfllkpaaf/dist/index.html');

})();

one more question - is there a way to open DevTools at the bottom of the page instead of on the side?

protected async Task<Browser> GetPuppeteerBrowser(bool headless, bool requireGeoUnblocking = false, string region = "USA")
        {
            Browser browser;

           
            string enableAutomation = "--enable-automation";
            string noSandBox = "--no-sandbox";
            string disableSetUidSandBox = "--disable-setuid-sandbox";
            string[] argumentsWithoutExtension = new string[] { "--disable-gpu", "--disable-dev-shm-usage", enableAutomation, disableSetUidSandBox, noSandBox };

            _logger.Information("Running with KProxy enabled mode in the Puppeteer Browser.");
            
            string baseDirectoryPath = Path.GetDirectoryName(this.GetType().Assembly.Location);
            _logger.Information("base directory path : {path}", baseDirectoryPath);
            string kproxyPath = Path.Combine(baseDirectoryPath, "artifacts", "kproxy");

            _logger.Information("kproxy path : {path}", kproxyPath);
            string disableExtensionPath = $"--disable-extensions-except={kproxyPath}";
            string loadExtensionPath = $"--load-extension={kproxyPath}";


            string[] argumentsWithExtension = new string[] { "--disable-gpu", "--disable-dev-shm-usage", disableExtensionPath, loadExtensionPath, enableAutomation, disableSetUidSandBox, noSandBox };

            browser = await Puppeteer.LaunchAsync(new LaunchOptions
            {
                Headless = false, // When loading extensions to browser it need to run with head.
                Args = argumentsWithExtension,
                IgnoreHTTPSErrors=true 
            });
            _logger.Information("running pupateer browser with version : {version}", await browser.GetVersionAsync());
            await UnblockBrowserForGeoRegionAsync(browser, region);

            return browser;
        }

The above code worked for me