Examine source code of Texture Flutterby

{
  "theme": {
    "images": {
      "theme_frame": "firefoxheaderwtexture.jpg"
    },
    "colors": {
      "frame": "#ed5c5c",
      "tab_background_text": "#080808"
    }
  },
  "version": "2.0",
  "name": "Texture Flutterby",
  "manifest_version": 2,
  "description": "Textured orange paper with various butterflies throughout."
}