Examine source code of Pronote ++

{
  "manifest_version": 2,
  "name": "Pronote ++",
  "description": "Affiche tes notes et ton évolution trimestrielle.",
  "version": "0.1.4",
  "icons": {
    "16": "img/icon.png",
    "48": "img/icon.png",
    "128": "img/icon.png"
  },
  "content_scripts": [
    {
      "js": [
        "content_scripts/app.js"
      ],
      "matches": [
        "https://*.index-education.net/pronote/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6cf31dcd-8b9a-4284-856e-dcc819ae30e2}"
    }
  }
}