Chrome extension to always select a specific user for Google Cloud Console

content.js

let url = new URL(window.location);
let authuser = url.searchParams.get('authuser');

// Log in as the account you always want to be logged-in as
// and replace 1 here with the authuser=N number in the url.
if (!authuser) {
  url.searchParams.set('authuser', '1');
  window.history.replaceState(null, null, url.toString());
  window.location.reload;
}

manifest.json

{
  "manifest_version": 2,
  "name": "Always login as specific user to Google Cloud Console",
  "version": "0.1",
  "content_scripts": [
    {
      "matches": [
        "https://cloud.google.com/*",
        "https://console.cloud.google.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}

Instructions for how to load a custom extension are here: https://robots.thoughtbot.com/how-to-make-a-chrome-extension