Examine source code of CBOR viewer

{
  "manifest_version": 2,
  "name": "CBOR decoder",
  "version": "0.1.0",
  "description": "Decode incoming CBOR request to make them human readable.",
  "icons": {
    "48": "pen.svg"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "57.0a1",
      "id": "{4d7ca1c4-38b6-4f97-8194-a1697c017a90}"
    }
  }
}