Always active Window - Always Visible

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "version": "0.3.2",
  "name": "Always active Window - Always Visible",
  "description": "Pretend that all browser windows are active by spoofing the visibility state event and more!",
  "permissions": [
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "action": {},
  "homepage_url": "https://webextension.org/listing/always-active.html",
  "icons": {
    "16": "/data/icons/16.png",
    "19": "/data/icons/19.png",
    "32": "/data/icons/32.png",
    "38": "/data/icons/38.png",
    "48": "/data/icons/48.png",
    "64": "/data/icons/64.png",
    "128": "/data/icons/128.png",
    "256": "/data/icons/256.png",
    "512": "/data/icons/512.png"
  },
  "background": {
    "service_worker": "worker.js"
  },
  "options_ui": {
    "page": "/data/options/index.html"
  }
}