Examine source code of Kuroha 2.0

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Kuroha 2.0",
  "description": "An update of old Kuroha theme.",
  "author": "Roysu",
  "homepage_url": "https://roymuke.tumblr.com/",
  "icons": {
    "16": "icon16.svg",
    "32": "icon32.svg"
  },
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.3)",
      "toolbar_text": "#f5fc72",
      "frame": "#221f1f",
      "tab_background_text": "#f5fc72",
      "toolbar_field": "rgba(255, 255, 255, 0.6)",
      "toolbar_field_text": "#000000",
      "tab_line": "#f5fc72",
      "popup": "#221f1f",
      "popup_text": "rgba(238, 238, 238, 0.85)",
      "button_background_active": "rgba(196, 0, 0, 0.72)",
      "button_background_hover": "rgba(196, 0, 0, 0.4)",
      "icons_attention": "#f5fc72",
      "icons": "#f5fc72",
      "ntp_background": "#221f1f",
      "ntp_text": "#f5fc72",
      "popup_border": "rgba(0, 0, 0, 0.3)",
      "popup_highlight": "rgba(196, 0, 0, 0.72)",
      "sidebar_border": "rgba(196, 0, 0, 0.3)",
      "sidebar_highlight": "rgba(196, 0, 0, 0.4)",
      "sidebar_text": "rgb(238, 238, 238)",
      "sidebar": "#221f1f",
      "tab_loading": "#f5fc72",
      "tab_selected": "rgba(255, 255, 255, 0.45)",
      "tab_text": "#f5fc72",
      "toolbar_bottom_separator": "rgba(0, 0, 0, 0.3)",
      "toolbar_field_border_focus": "rgba(196, 0, 0, 0.72)",
      "toolbar_field_border": "rgba(196, 0, 0, 0.3)",
      "toolbar_field_focus": "rgba(34, 31, 31, 0.1)",
      "toolbar_field_highlight": "rgba(196, 0, 0, 0.72)",
      "toolbar_field_separator": "rgba(196, 0, 0, 0.4)",
      "toolbar_field_text_focus": "rgb(238, 238, 238)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0.3)"
    }
  }
}