Examine source code of Block Unicode domains

{
  "manifest_version": 2,
  "name": "Block Unicode domains",
  "short_name": "BUd",
  "version": "1.0.1",
  "description": "To protect users from URL spoofing, block if the domain string is Unicode.",
  "homepage_url": "https://github.com/catshelf/BUd",
  "icons": {
    "48": "icons/icon.png"
  },
  "permissions": [
    "*://*/*",
    "webRequest",
    "webRequestBlocking",
    "alarms"
  ],
  "browser_action": {
    "default_icon": "icons/icon_on.svg",
    "default_title": "BUd: *On*"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6bf5d6b-0c2d-4fdb-aa67-15972f08e25b}"
    }
  }
}