Examine source code of Winter pattern

{
  "name": "Winter pattern",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "snowflakes.jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 0.83)",
      "tab_background_text": "rgba(255, 255, 255, 1)"
    }
  }
}