Examine source code of Ping Sentry

{
  "manifest_version": 2,
  "name": "Ping Sentry",
  "description": "Keep an eye on availability: background HTTP checks with timeouts, latency display and per-site uptime history.",
  "version": "2.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "{cae4b72f-be03-4060-a589-a92e85698841}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "64": "images/icon-64.png",
    "96": "images/icon-96.png",
    "128": "images/icon-128.png"
  },
  "permissions": [
    "storage",
    "notifications",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "app/core.js",
      "app/background.js"
    ]
  },
  "browser_action": {
    "default_title": "Ping Sentry",
    "default_popup": "app/popup.html",
    "default_icon": {
      "32": "images/icon-32.png",
      "48": "images/icon-48.png",
      "64": "images/icon-64.png",
      "96": "images/icon-96.png",
      "128": "images/icon-128.png"
    }
  }
}