Examine source code of clocks ticking down

{
  "theme": {
    "images": {
      "theme_frame": "clockstickingdown.jpg"
    },
    "colors": {
      "frame": "#edc193",
      "tab_background_text": "#faf5f5"
    }
  },
  "version": "2.0",
  "name": "clocks ticking down",
  "manifest_version": 2,
  "description": "clocks and confetti"
}