Examine source code of Free Mobile Viewer

{
  "manifest_version": 3,
  "name": "Mobile Viewer",
  "version": "1.3",
  "description": "Simulateur d'appareil mobile multifonctions.",
  "browser_specific_settings": {
    "gecko": {
      "id": "simulateur-mobile-pro@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "declarativeNetRequest",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "Ouvrir le simulateur mobile"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "darkmode.css"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset_1",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  }
}