Examine source code of RONdomizer

{
  "manifest_version": 2,
  "name": "RONdomizer",
  "description": "Generates random values for fingerprint parameters",
  "author": "Carlos Jeurissen",
  "homepage_url": "https://apps.jeurissen.co/rondomizer",
  "content_security_policy": "default-src 'none'; child-src 'none'; connect-src 'none'; font-src 'none'; frame-src 'none'; manifest-src 'none'; media-src 'none'; object-src 'none'; prefetch-src 'none'; worker-src 'none'; img-src 'none'; script-src 'none'; script-src-elem 'none'; script-src-attr 'none'; style-src 'none'; style-src-elem 'none'; style-src-attr 'none'; base-uri 'none'; form-action 'none'; frame-ancestors 'none'; block-all-mixed-content; upgrade-insecure-requests; require-sri-for script style; sandbox",
  "developer": {
    "name": "Carlos Jeurissen",
    "url": "https://apps.jeurissen.co/"
  },
  "version": "0.1.1",
  "minimum_chrome_version": "35",
  "minimum_opera_version": "15",
  "applications": {
    "gecko": {
      "id": "rondomizer@jeurissen.app"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rondomizer@jeurissen.app"
    }
  },
  "icons": {
    "16": "icon.svg",
    "32": "icon.svg",
    "48": "icon.svg",
    "96": "icon.svg",
    "128": "icon.svg",
    "256": "icon.svg"
  },
  "content_scripts": [
    {
      "js": [
        "inject.js"
      ],
      "matches": [
        "*://*/**"
      ],
      "all_frames": true
    }
  ]
}