Examine source code of Unicode Domain Guard

{
  "manifest_version": 2,
  "name": "Unicode Domain Guard",
  "version": "1.0.2",
  "description": "Gives you a warning when visiting domains with Unicode characters.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "unicode-warning@yonn",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_personal_data": false,
        "collects_usage_data": false,
        "contains_tracking": false
      }
    }
  }
}