Examine source code of Slow Pages

{
  "manifest_version": 2,
  "name": "Slow Pages",
  "version": "1.1",
  "description": "Detects performance issues on page.",
  "permissions": [
    "tabs",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/64.png"
  },
  "icons": {
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{333888e4-8202-426d-bcbc-4dfed8d6d8de}",
      "strict_min_version": "64.0"
    }
  }
}