Examine source code of Faint light

{
  "theme": {
    "images": {
      "theme_frame": "c101016fu--kemon-mozakiri-33.jpg"
    },
    "colors": {
      "frame": "#d9d2d2",
      "tab_background_text": "#e9edb0"
    }
  },
  "version": "2.0",
  "name": "Faint light",
  "manifest_version": 2,
  "description": "ほのかな明かり"
}