Examine source code of Dark Old-time pattern

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#211f14",
      "tab_background_text": "#fefff7"
    }
  },
  "version": "2.0",
  "name": "Dark Old-time pattern",
  "manifest_version": 2
}