Examine source code of ED Moyenne

{
  "manifest_version": 2,
  "name": "ED Moyenne",
  "version": "1.0.1resigned1",
  "description": "Calcule la moyenne facilement sur EcoleDirecte",
  "author": "Nathan DECHER",
  "content_scripts": [
    {
      "matches": [
        "https://www.ecoledirecte.com/Eleves/*/Notes",
        "http://www.ecoledirecte.com/Eleves/*/Notes"
      ],
      "js": [
        "EDMoyenne.js"
      ],
      "css": [
        "EDMoyenne.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4d7a94ec-36ca-4f84-aa72-51ecf1ae9b9f}"
    }
  }
}