Examine source code of Blue Rust

{
  "theme": {
    "images": {
      "theme_frame": "bluerust.jpg"
    },
    "colors": {
      "frame": "#a3c0d1",
      "tab_background_text": "#f5f1cc"
    }
  },
  "version": "2.0",
  "name": "Blue Rust",
  "manifest_version": 2,
  "description": "Created from scratch in Photoshop"
}