Examine source code of Summer Sunrise

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#f09f09",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Summer Sunrise",
  "manifest_version": 2,
  "description": "Yellow with a darkened circle to represent the sun."
}