Examine source code of Dark++

{
  "name": "Dark++",
  "author": "Kent Leo L. Makibulan",
  "manifest_version": 2,
  "version": "1.0.1",
  "theme": {
    "colors": {
      "bookmark_text": "#ffffff",
      "button_background_active": "#505154",
      "button_background_hover": "#454649",
      "icons": "#f1f3f4",
      "icons_attention": "#eaeaea",
      "frame": "#202124",
      "frame_inactive": "#3c4043",
      "ntp_background": "#35363a",
      "ntp_text": "#ffffff",
      "popup": "#292a2d",
      "popup_border": "#3c4043",
      "popup_highlight": "#444547",
      "popup_highlight_text": "#ffffff",
      "popup_text": "#ffffff",
      "sidebar": "#292a2d",
      "sidebar_border": "3c4043",
      "sidebar_highlight": "#444547",
      "sidebar_highlight_text": "#ffffff",
      "sidebar_text": "#ffffff",
      "tab_background_separator": "#545454",
      "tab_background_text": "#eeeeee",
      "tab_line": "#ffffff",
      "tab_loading": "#ffffff",
      "tab_selected": "#35363a",
      "tab_text": "#ffffff",
      "toolbar": "#35363a",
      "toolbar_bottom_separator": "#282828",
      "toolbar_field": "#202124",
      "toolbar_field_border": "#202124",
      "toolbar_field_border_focus": "#202124",
      "toolbar_field_focus": "#202124",
      "toolbar_field_highlight": "#444547",
      "toolbar_field_highlight_text": "#ffffff",
      "toolbar_field_separator": "#363739",
      "toolbar_field_text": "#ffffff",
      "toolbar_field_text_focus": "#ffffff",
      "toolbar_text": "#ffffff",
      "toolbar_top_separator": "#282828",
      "toolbar_vertical_separator": "#6e7073"
    }
  }
}