Examine source code of Easy Editos

{
  "manifest_version": 3,
  "name": "Easy Editos",
  "description": "Permet d'afficher les définitions quand on double-clique sur un mot dans un article du journal Le Monde.",
  "version": "2.1.1",
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icons/128.jpg",
    "default_title": "Easy Editos"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "easyeditos.contact@gmail.com"
    }
  },
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "host_permissions": [
    "*://www.lemonde.fr/*"
  ],
  "icons": {
    "16": "icons/16.jpg",
    "32": "icons/32.jpg",
    "48": "icons/48.jpg",
    "128": "icons/128.jpg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.lemonde.fr/*/article/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ]
}