Examine source code of Has evolved gradually. .

{
  "theme": {
    "images": {
      "theme_frame": "0620-jojoni-sinka-oo-siro-ue-l4-sy.jpg"
    },
    "colors": {
      "frame": "#ccede8",
      "tab_background_text": "#c2ecf2"
    }
  },
  "version": "2.0",
  "name": "Has evolved gradually. .",
  "manifest_version": 2,
  "description": "徐々に進化してきました。 。\n\n\n\n0620-jojoni-sinka-oo-siro-ue-l4-sy-●"
}