Examine source code of Brushed Metal - XP

{
  "theme": {
    "images": {
      "theme_frame": "BrushedH4.png"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#2c2c2c"
    }
  },
  "version": "2.0",
  "name": "Brushed Metal - XP",
  "manifest_version": 2,
  "description": "A clean and simple brushed metal theme for Firefox."
}