Examine source code of ENT

{
  "manifest_version": 2,
  "name": "Menu ENT",
  "version": "2018.1102resigned1",
  "description": "Raccourcis ENT",
  "author": "David QUELQUEJEU",
  "icons": {
    "48": "icones/48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://emile-littre-douchy-les-mines.savoirsnumeriques5962.fr/*"
      ],
      "js": [
        "ent.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icones/not.svg",
    "icones/c2t.svg",
    "icones/cp.svg",
    "icones/msg.svg",
    "icones/eduline.svg",
    "icones/sp.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{239b2396-e410-407b-8ba1-dc00bed6ec5f}"
    }
  }
}