Examine source code of Like tree rings.

{
  "theme": {
    "images": {
      "theme_frame": "pl0223-moz-233-c500-c12-kuroo-fr-papl-l4.jpg"
    },
    "colors": {
      "frame": "#e3e3e3",
      "tab_background_text": "#690505"
    }
  },
  "version": "2.0",
  "name": "Like tree rings.",
  "manifest_version": 2,
  "description": "年輪のように。。\n\n\n\npl0223-moz-233-c500-c12-kuroo-fr-papl-l4●"
}