Examine source code of Tic-Tac-Toe Game html

{
  "manifest_version": 2,
  "name": "Tic-Tac-Toe Game html",
  "version": "1.0",
  "description": "Tic-Tac-Toe game is a simple game but requires good thinking. The simple way to play is to star three boxes on the same line to win.",
  "browser_action": {
    "default_popup": "tictactoe.html",
    "default_icon": {
      "16": "images/tic-logo.png",
      "48": "images/tic-logo.png",
      "128": "images/tic-logo.png"
    }
  },
  "icons": {
    "16": "images/tic-logo.png",
    "48": "images/tic-logo.png",
    "128": "images/tic-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4a872a5b-9135-4b83-8461-1ac5b9cdbe1c}"
    }
  }
}