Examine source code of Another Day in Space

{
  "manifest_version": 2,
  "version": "4",
  "name": "anotherdayinspace",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(209, 0, 129, 0.01)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(60, 33, 63)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(42, 26, 77, 0.48)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(56, 105, 104)",
      "popup": "rgb(65, 59, 72)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(65, 59, 72)",
      "button_background_hover": "rgba(136, 108, 165, 0.57)",
      "frame_inactive": "rgb(56, 105, 104)",
      "ntp_background": "rgb(115, 116, 117)",
      "popup_border": "rgb(56, 105, 104)",
      "popup_highlight_text": "rgb(85, 72, 72)",
      "popup_highlight": "rgb(143, 143, 143)",
      "sidebar_border": "rgb(154, 153, 152)",
      "sidebar_highlight_text": "rgb(245, 245, 245)",
      "sidebar_highlight": "rgb(56, 105, 104)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(65, 59, 72)",
      "tab_background_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(91, 174, 181)",
      "tab_selected": "rgba(136, 108, 165, 0.57)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(112, 110, 110)",
      "toolbar_field_border": "rgb(56, 105, 104)",
      "toolbar_field_focus": "rgb(65, 59, 72)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(11, 87, 117)",
      "toolbar_field_separator": "rgb(56, 105, 104)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "toolbar_vertical_separator": "rgb(56, 105, 104)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{64422d6f-4f05-4dc6-b644-fec8cb9c10ce}"
    }
  }
}