Examine source code of Yet another gray gradient

{
  "theme": {
    "images": {
      "theme_frame": "Screenshot2010-11-24at4.18.35PMcopy.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Yet another gray gradient",
  "manifest_version": 2,
  "description": "Made for myself. Use it if you want."
}