Examine source code of Never Gonna Rickroll You

{
  "name": "Never Gonna Rickroll You",
  "manifest_version": 2,
  "version": "0.1",
  "icons": {
    "64": "logo.png"
  },
  "permissions": [
    "storage",
    "<all_urls>",
    "activeTab"
  ],
  "content_scripts": [
    {
      "all_frames": true,
      "match_about_blank": true,
      "matches": [
        "http://*/*",
        "https://*/*",
        "<all_urls>"
      ],
      "js": [
        "detecter.js"
      ]
    }
  ],
  "description": "Anti Rickroll",
  "homepage_url": "https://rien.tk",
  "web_accessible_resources": [
    "*.html",
    "logo.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4ed7f460-7f42-4faa-bc7f-8cffcfa940b1}"
    }
  }
}