Examine source code of Keep Awake

{
  "manifest_version": 3,
  "name": "Keep Awake",
  "version": "1.0.3",
  "description": "Stop your screen from sleeping. One toggle. Optional timer. No data collected.",
  "permissions": [
    "storage",
    "alarms",
    "activeTab",
    "scripting"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Keep Awake",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-inactive-16.png",
      "32": "icons/icon-inactive-32.png",
      "48": "icons/icon-inactive-48.png",
      "128": "icons/icon-inactive-128.png"
    }
  },
  "commands": {
    "toggle-keep-awake": {
      "suggested_key": {
        "default": "Alt+Shift+K"
      },
      "description": "Toggle Keep Awake"
    }
  },
  "icons": {
    "16": "icons/icon-inactive-16.png",
    "32": "icons/icon-inactive-32.png",
    "48": "icons/icon-inactive-48.png",
    "128": "icons/icon-inactive-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "keep-awake@extendforge.com",
      "strict_min_version": "126.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content/wake-lock.js"
      ],
      "run_at": "document_idle"
    }
  ]
}