Examine source code of Gitlab Notifications

{
  "name": "Gitlab Notifications",
  "description": "An extension for additional notifications on Gitlab",
  "manifest_version": 2,
  "permissions": [
    "notifications",
    "alarms",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "extension-icon-128.png"
  },
  "version": "1.0.3",
  "browser_specific_settings": {
    "gecko": {
      "id": "{ffabc2a1-320f-45de-94ba-ec50d538f6ea}"
    }
  }
}