Examine source code of Brushed Steel Gradient

{
  "theme": {
    "images": {
      "theme_frame": "brushed-steel-top.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#1a1a1a"
    }
  },
  "version": "2.0",
  "name": "Brushed Steel Gradient",
  "manifest_version": 2,
  "description": "Brushed Steel Gradient"
}