Examine source code of Bentley Black

{
  "theme": {
    "images": {
      "theme_frame": "bentley-2.png"
    },
    "colors": {
      "frame": "#63826d",
      "tab_background_text": "#bac"
    }
  },
  "version": "2.0",
  "name": "Bentley Black",
  "manifest_version": 2,
  "description": "Classic Bentley \"Flying Spur\" with emerald green and turquoise accents, shadows and glow on a flat black background.  Definitely gives Firefox a very pristine feel!"
}