Examine source code of doodle physics

{
  "name": "doodle physics",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "hand-drawn-physics-vector-doodle-set-hand-drawn-physics-doodle-set-lettering-physics-117458832.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 4, 0, 1)"
    }
  }
}