Examine source code of IDND

{
  "manifest_version": 2,
  "name": "IDND",
  "version": "2.2resigned1",
  "description": "Por detekti IDN-retadresojn.",
  "author": "lingvo.org",
  "homepage_url": "https://lingvo.org/idnd",
  "applications": {
    "gecko": {
      "id": "{9757e92f-94d4-4b02-ba2d-0454955c7e4b}",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "32": "piktogramoj/idnd.png"
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "notifications",
    "contextMenus",
    "tabs"
  ],
  "background": {
    "scripts": [
      "punycode.js",
      "idnd.js",
      "fono/fono.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "32": "piktogramoj/idnd.png"
    },
    "default_title": "IDND",
    "default_popup": "shprucoj/idnd.html"
  }
}