Tic Tac Toe

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Tic Tac Toe",
  "version": "1.13",
  "manifest_version": 2,
  "description": "A fun tic tac toe game.",
  "browser_action": {
    "default_icon": "tictactoelogo.png",
    "default_popup": "single.html"
  }
}