Examine source code of Minimal Blue sand

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ada5bd",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Minimal Blue sand",
  "manifest_version": 2,
  "description": "very plain and simple color background.\nmade to integrate with \"vertical-bar\" and \"tree style tabs\""
}