Background Color Change

manifest.json

{
  "manifest_version": 3,
  "name": "Background Color Change",
  "version": "1.0",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "service_worker": "background.js",
    "type": "module"
  },
  "action": {},
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}