Examine source code of deep space nebula

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nebula",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(128, 0, 234)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(128, 0, 234)",
      "tab_line": "rgb(39, 0, 130)",
      "popup": "rgba(136, 92, 172, 0.46)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(128, 0, 234)",
      "button_background_hover": "rgba(136, 92, 172, 0.33)",
      "frame_inactive": "rgb(128, 0, 234)",
      "icons_attention": "rgb(0, 0, 0)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(255, 255, 255)",
      "ntp_text": "rgb(225, 234, 239)",
      "popup_border": "rgb(0, 0, 0)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "sidebar_border": "rgb(128, 0, 234)",
      "sidebar_highlight": "rgb(128, 0, 234)",
      "sidebar": "rgb(0, 0, 0)",
      "tab_loading": "rgb(128, 0, 234)",
      "tab_selected": "rgb(255, 255, 255)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgb(0, 0, 0)",
      "toolbar_field_focus": "rgb(0, 0, 0)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgba(136, 92, 172, 0.61)",
      "toolbar_field_text_focus": "rgb(128, 0, 234)",
      "toolbar_top_separator": "rgb(128, 0, 234)",
      "toolbar_vertical_separator": "rgb(0, 0, 0)"
    }
  }
}