Examine source code of Dr. Steel

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#292929",
      "tab_background_text": "#bfbfbf"
    }
  },
  "version": "2.0",
  "name": "Dr. Steel",
  "manifest_version": 2,
  "description": "Persona for all followers of Dr. Steel and his cause. Industrial/Steampunk design with quite warm texture of rust and Dr. Steel's logo.\n\nToy Soldiers Unite!"
}