Examine source code of Manga

{
  "name": "Manga",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "manga.jpg"
    },
    "colors": {
      "frame": "rgba(59, 8, 10, 1)",
      "tab_background_text": "rgba(112, 54, 31, 1)",
      "toolbar": "rgba(148, 124, 124, 1)",
      "bookmark_text": "rgba(255, 176, 176, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(102, 53, 53, 1)"
    }
  }
}