Examine source code of Intradible

{
  "manifest_version": 2,
  "name": "Intradible",
  "version": "2.0",
  "description": "Makes your trace results super cool.",
  "icons": {
    "48": "icons/icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://intra.forge.epita.fr/*"
      ],
      "js": [
        "trace.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "tabs",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "*://intra.forge.epita.fr/*"
  ],
  "web_accessible_resources": [
    "assets/incredible.mp3"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5a96b860-032e-45ef-84c5-c68edd2a0a1f}"
    }
  }
}