Examine source code of Custom made space theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Custom made space theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(3, 1, 12)",
      "toolbar_text": "rgb(104, 70, 255)",
      "frame": "rgb(35, 17, 90)",
      "tab_background_text": "rgb(113, 119, 223)",
      "toolbar_field": "rgb(210, 178, 255)",
      "toolbar_field_text": "rgb(13, 0, 52)",
      "tab_line": "rgb(37, 0, 207)",
      "popup": "rgb(3, 1, 12)",
      "popup_text": "rgb(113, 119, 223)",
      "icons_attention": "rgb(75, 0, 255)",
      "icons": "rgb(64, 0, 255)",
      "ntp_background": "rgb(6, 1, 18)",
      "ntp_text": "rgb(214, 186, 255)",
      "popup_border": "rgb(8, 2, 2)",
      "sidebar_border": "rgb(6, 1, 18)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(81, 3, 217)",
      "sidebar_text": "rgb(171, 42, 229)",
      "sidebar": "rgb(10, 2, 25)",
      "tab_loading": "rgb(75, 0, 255)",
      "tab_text": "rgb(207, 133, 255)",
      "toolbar_bottom_separator": "rgb(75, 0, 255)",
      "toolbar_field_border_focus": "rgb(75, 0, 255)",
      "toolbar_field_border": "rgb(75, 0, 255)",
      "toolbar_field_highlight": "rgb(110, 61, 255)",
      "toolbar_vertical_separator": "rgb(64, 0, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{23766e34-986f-4ff3-b970-c4934420258e}"
    }
  }
}