Examine source code of CSRF spotter

{
  "manifest_version": 2,
  "name": "CSRF spotter",
  "version": "1.0",
  "description": "Find potential CSRF vulnerabilities",
  "icons": {
    "48": "icons/csrf.svg",
    "96": "icons/csrf.svg"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/csrf.svg",
    "default_title": "CSRF spotter",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_end",
      "js": [
        "csrf.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}