Examine source code of URL Character Guard

{
  "manifest_version": 2,
  "name": "URL Character Guard",
  "version": "1.1",
  "description": "An extension that helps protect users from accessing websites containing Cyrillic characters, which might be used for phishing or other malicious purposes.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "blocked.html",
    "blocked.js"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{21a87995-9cad-412d-9cff-5105453235c1}"
    }
  }
}