Examine source code of Russian Winter

{
  "name": "Russian Winter",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "header2.jpg"
    },
    "colors": {
      "frame": "rgba(208, 214, 217, 1)",
      "tab_background_text": "#000000",
      "bookmark_text": "rgba(84, 102, 115, 1)"
    }
  }
}