Examine source code of Tohka

{
  "name": "Date A Live",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Date-A-Live-Collection-Ann_06-20-17.jpg"
    },
    "colors": {
      "toolbar": "rgba(212, 195, 195, 0)",
      "toolbar_field": "rgba(155, 205, 222, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 0.27)",
      "frame": "rgba(255, 255, 255, 0.52)",
      "tab_background_text": "rgba(209, 193, 193, 0.79)",
      "bookmark_text": "rgba(105, 214, 210, 1)"
    }
  }
}