Examine source code of leboncoin PDF

{
  "manifest_version": 2,
  "name": "leboncoin PDF",
  "description": "Exportez vos annonces leboncoin en PDF",
  "version": "2.2.6",
  "icons": {
    "128": "icon/128.png",
    "512": "icon/512.png"
  },
  "permissions": [
    "storage",
    "*://*.leboncoin.fr/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      },
      "id": "{55a4be35-e4be-40dc-a87e-ea6a58d04f46}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "leboncoin PDF",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.leboncoin.fr/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}