Examine source code of Metal Pattern 2

{
  "theme": {
    "images": {
      "theme_frame": "metal_pattern2.jpg"
    },
    "colors": {
      "frame": "#134a30",
      "tab_background_text": "#fcf9f9"
    }
  },
  "version": "2.0",
  "name": "Metal Pattern 2",
  "manifest_version": 2,
  "description": "Industrial metal pattern"
}