Examine source code of Old Leather

{
  "theme": {
    "images": {
      "theme_frame": "old-leather-persona-header.jpg"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#f9fcdb"
    }
  },
  "version": "2.0",
  "name": "Old Leather",
  "manifest_version": 2,
  "description": "Old Leather texture for your browser"
}