Examine source code of Shelf Shuffle: Sort & Match

{
  "manifest_version": 3,
  "name": "Shelf Shuffle: Sort & Match",
  "short_name": "Shelf Shuffle",
  "version": "1.0.0",
  "description": "A cozy puzzle game where you tidy up messy shelves by sorting items into matching sets. Official Firefox Extension.",
  "author": "MD Abu Nafis Niloy",
  "homepage_url": "https://nafisniloy.itch.io/shelf-shuffle",
  "permissions": [
    "tabs"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Play Shelf Shuffle",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "sidebar_action": {
    "default_title": "Shelf Shuffle Sidebar",
    "default_panel": "game.html",
    "default_icon": "icons/icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "shelf-shuffle@extension.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self';"
  }
}