manifest.json

{
  "manifest_version": 2,
  "name": "Spoof detect",
  "version": "0.1",
  "icons": {
    "48": "icons/48.png"
  },
  "description": "Try to detect website spoofing",
  "content_scripts": [
    {
      "matches": ["<all_urls>"],
      "js": ["detect.js"]
    }
  ]
}