Examine source code of Modern Snake Game

{
  "manifest_version": 3,
  "name": "Modern Snake Game",
  "version": "1.0.3",
  "description": "Play the classic Snake Game instantly from a popup! Features HD graphics, 50+ unlockable achievements, and new daily challenges.",
  "action": {
    "default_title": "Play Modern Snake"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "modern-snake-game@antigravity.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "assets/16x16.png",
    "48": "assets/48x48.png",
    "128": "assets/128x128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "notifications"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "game.html",
        "style.css",
        "game.js",
        "audio.js",
        "assets/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}