Examine source code of Dark with Reds

{
  "manifest_version": 2,
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "Dark_with_Reds@firefox.clu-os.net",
      "strict_min_version": "61.0"
    }
  },
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "0.1.1",
  "theme": {
    "colors": {
      "frame": "#202020",
      "frame_inactive": "#000000",
      "tab_line": "#00000000",
      "tab_selected": "#ffffff20",
      "tab_loading": "#ff000080",
      "tab_text": "#e8e8d8",
      "tab_background_text": "#9f9f98",
      "tab_background_separator": "#ffffff20",
      "toolbar": "#ffffff20",
      "toolbar_top_separator": "#ffffff40",
      "toolbar_bottom_separator": "#00000040",
      "toolbar_vertical_separator": "#ffffff20",
      "toolbar_field_separator": "#ffffff20",
      "toolbar_text": "#e8e8d8",
      "toolbar_field": "#00000080",
      "toolbar_field_focus": "#000000f0",
      "toolbar_field_border": "#00000000",
      "toolbar_field_border_focus": "#00000000",
      "toolbar_field_text": "#e8e8d8",
      "toolbar_field_text_focus": "#e8e8d8",
      "toolbar_field_highlight": "#ff000080",
      "toolbar_field_highlight_text": "#e8e8d8",
      "button_background_hover": "#ffffff20",
      "button_background_active": "#000000f0",
      "icons": "#ff3f3f",
      "icons_attention": "#0a84ff",
      "popup": "#000000f0",
      "popup_border": "#202020",
      "popup_text": "#9f9f98",
      "popup_highlight": "#ff000080",
      "popup_highlight_text": "#e8e8d8",
      "sidebar": "#101010",
      "sidebar_border": "#ff000080",
      "sidebar_text": "#e8e8d8",
      "sidebar_highlight": "#ff000080",
      "ntp_background": "#101010",
      "ntp_text": "#e8e8d8"
    },
    "properties": {
      "color_scheme": "dark",
      "content_color_scheme": "dark"
    }
  }
}