Examine source code of cross white background

{
  "theme": {
    "images": {
      "theme_frame": "whitebackground.jpg"
    },
    "colors": {
      "frame": "#9e0b0b",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "cross white background",
  "manifest_version": 2,
  "description": "cross - white background"
}