code: def _add_chrome_proxy_extension(
          chrome_options, proxy_string, proxy_user, proxy_pass):
      
      if not "".join(sys.argv) == "-c":
          # Single-threaded
          proxy_helper.create_proxy_zip(proxy_string, proxy_user, proxy_pass)
      else:
          # Pytest multi-threaded test
          lock = threading.Lock()
          with lock:
              time.sleep(random.uniform(0.02, 0.15))
              if not os.path.exists(PROXY_ZIP_PATH):
                  proxy_helper.create_proxy_zip(
                      proxy_string, proxy_user, proxy_pass)
              time.sleep(random.uniform(0.1, 0.2))
      proxy_zip = PROXY_ZIP_PATH
      if not os.path.exists(PROXY_ZIP_PATH):
          # Handle "Permission denied" on the default proxy.zip path
          proxy_zip = PROXY_ZIP_PATH_2
      chrome_options.add_extension(proxy_zip)
      return chrome_options
docs: Implementation of https://stackoverflow.com/a/35293284 for
          https://stackoverflow.com/questions/12848327/
          (Run Selenium on a proxy server that requires authentication.)