Examine source code of Compagnon CasusNo

{
  "manifest_version": 2,
  "name": "Compagnon CasusNo",
  "version": "1.0",
  "description": "Compagnon CasusNo proposant des outils d'amélioration de l'interface",
  "browser_specific_settings": {
    "gecko": {
      "id": "casusno-companion@condutiarii.fr",
      "strict_min_version": "72.0"
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "https://www.casusno.fr/*",
    "storage",
    "tabs",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "Compagnon CasusNo"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.casusno.fr/search.php?*search_id=unreadposts*"
      ],
      "js": [
        "script.js"
      ]
    }
  ]
}