Examine source code of Gradually evolved.

{
  "theme": {
    "images": {
      "theme_frame": "0620--l2h-mei-hante-igawak--syoo.jpg"
    },
    "colors": {
      "frame": "#f2d9b1",
      "tab_background_text": "#dd8eed"
    }
  },
  "version": "2.0",
  "name": "Gradually evolved.",
  "manifest_version": 2,
  "description": "徐々に進化した。。02　\n\n\n\n0620--l2h-mei-hante-igawak--syoo●"
}