Examine source code of Kaisen(Official)

{
  "name": "Kaisen(Official)",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "persona.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(112, 112, 112, 1)",
      "toolbar": "rgba(38, 38, 44, 1)",
      "bookmark_text": "rgba(206, 17, 15, 1)",
      "toolbar_field": "rgba(153, 153, 153, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(168, 0, 0, 0.4)"
    }
  }
}