Examine source code of Master Storm

{
  "theme": {
    "images": {
      "theme_frame": "MasterStorm-firefoxheader.jpg"
    },
    "colors": {
      "frame": "#787878",
      "tab_background_text": "#6c5cff"
    }
  },
  "version": "2.0",
  "name": "Master Storm",
  "manifest_version": 2,
  "description": "Custom wallpaper creation turned into a theme for personas. BAkware99."
}