Examine source code of Glassy grassy sunset

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#d1f0ff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Glassy grassy sunset",
  "manifest_version": 2,
  "description": "Created from wallpaper named Grassy Sunset, which I use, to make my firefox transparent."
}