Examine source code of Macron Manu

{
  "manifest_version": 2,
  "name": "Macron Manu",
  "version": "1.1resigned1",
  "description": "Tout simple, remplace le nom d'Emmanuel Macron par Manu !",
  "icons": {
    "96": "icons/96.png",
    "256": "icons/256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{42d43c7b-e473-404d-83d0-44cd87b81854}"
    }
  }
}