Examine source code of Rainbow Ascent

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "ROYGBIV Meets Linear Vertician",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.65)",
      "toolbar_text": "rgba(73, 213, 219, 0.67)",
      "frame": "rgb(13, 13, 13)",
      "tab_background_text": "rgb(241, 71, 81)",
      "toolbar_field": "rgba(0, 143, 143, 0.3)",
      "toolbar_field_text": "rgb(99, 189, 189)",
      "tab_line": "rgba(60, 241, 237, 0.22)",
      "popup": "rgba(159, 31, 31, 0.64)",
      "popup_text": "rgba(242, 185, 223, 0.95)",
      "button_background_active": "rgba(125, 29, 45, 0.71)",
      "button_background_hover": "rgba(139, 26, 62, 0.57)",
      "icons": "rgb(88, 205, 212)",
      "toolbar_bottom_separator": "rgba(22, 108, 112, 0.37)",
      "toolbar_field_border": "rgba(24, 112, 112, 0.23)",
      "toolbar_top_separator": "rgba(11, 51, 55, 0.69)",
      "toolbar_vertical_separator": "rgba(39, 159, 161, 0.5)",
      "tab_loading": "rgba(60, 241, 237, 0.22)"
    }
  }
}