Examine source code of Sleep Timer Reload

{
  "author": "Miguel Saragosse",
  "manifest_version": 2,
  "name": "Sleep Timer Fix Reload",
  "version": "1.1.3",
  "description": "Put any tab on a sleep timer to reload, close, or mute the tab when the timer expires.",
  "permissions": [
    "activeTab",
    "scripting",
    "alarms"
  ],
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{20b05ec1-cfe5-424a-a829-9a1ada706e21}"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "60": "icons/icon.svg"
  },
  "browser_action": {
    "default_icon": {
      "60": "icons/icon.svg"
    },
    "default_popup": "popup/popup.html",
    "default_title": "Sleep Timer"
  }
}