Examine source code of Black Red Theme

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "blackredtheme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(162, 162, 162)",
      "toolbar_field": "rgba(15, 15, 15, 0.61)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(233, 34, 34)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(221, 46, 46)",
      "button_background_hover": "rgba(221, 46, 46, 0.58)",
      "ntp_background": "#000000",
      "ntp_text": "rgba(255, 255, 255, 0.8)",
      "popup_border": "rgb(221, 46, 46)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "sidebar_border": "rgba(0, 0, 0, 0)",
      "sidebar_highlight_text": "rgb(221, 46, 46)",
      "sidebar_highlight": "rgb(221, 46, 46)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(0, 0, 0)",
      "tab_background_separator": "rgb(0, 0, 0)",
      "tab_loading": "rgb(204, 54, 42)",
      "toolbar_bottom_separator": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgb(233, 34, 34)",
      "toolbar_field_border": "rgb(0, 0, 0)",
      "toolbar_field_focus": "rgb(0, 0, 0)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(158, 39, 39)",
      "toolbar_field_separator": "rgba(15, 15, 15, 0)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(0, 0, 0)",
      "toolbar_vertical_separator": "rgb(0, 0, 0)"
    }
  }
}