Examine source code of Steel pattern

{
  "theme": {
    "images": {
      "theme_frame": "1metalheader.png"
    },
    "colors": {
      "frame": "#333131",
      "tab_background_text": "#e0e0e0"
    }
  },
  "version": "2.0",
  "name": "Steel pattern",
  "manifest_version": 2
}