Examine source code of PronoteMask

{
  "manifest_version": 2,
  "name": "PronoteMask",
  "version": "2.0",
  "description": "Retire automatiquement vos informations personnelles sur votre espace Pronote.",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "128": "img/logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/pronote/eleve*",
        "*://*/pronote/parent*"
      ],
      "js": [
        "script.js"
      ]
    }
  ]
}