Examine source code of Rick-Roll Protection

{
  "manifest_version": 2,
  "name": "Rick-Roll Protection",
  "background": {
    "scripts": [
      "rickroll_protection.js"
    ]
  },
  "description": "A simple extension to detect and close possible rick-rolls. Detects over 10 different rick-rolls.",
  "version": "1.0.0",
  "icons": {
    "128": "images/icon_128.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1b0f483a-833c-4f1c-9c89-1b558f1679ab}"
    }
  }
}