Examine source code of Daily Puzzle Tab

{
  "manifest_version": 2,
  "name": "Daily Puzzle Tab",
  "version": "1.0",
  "description": "Play a daily Sudoku or Crossword puzzle every time you open a new tab.",
  "chrome_url_overrides": {
    "newtab": "puzzle.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c8632643-60fa-4e74-b964-6ba497b55032}"
    }
  }
}