Examine source code of 2048 Game

{
  "name": "2048",
  "version": "0.2.3",
  "manifest_version": 3,
  "description": "A Fun Tile Based Game Recreated Into A Extension",
  "icons": {
    "16": "Icons/icon16x16.png",
    "32": "Icons/icon32x32.png",
    "48": "Icons/icon48x48.png",
    "128": "Icons/icon128x128.png"
  },
  "action": {
    "default_popup": "Game/index.html",
    "default_icon": {
      "16": "Icons/icon16x16.png",
      "32": "Icons/icon32x32.png",
      "48": "Icons/icon48x48.png",
      "128": "Icons/icon128x128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "oscarcoder99@gmail.com"
    }
  }
}