Examine source code of Wet Sand

{
  "theme": {
    "images": {
      "theme_frame": "WetSandTop.jpg"
    },
    "colors": {
      "frame": "#996633",
      "tab_background_text": "#330000"
    }
  },
  "version": "2.0",
  "name": "Wet Sand",
  "manifest_version": 2,
  "description": "A very subtle sand texture, matched in feel to the default Firefox theme colors, that adds a little extra, subtle touch to the look of the browser."
}