Examine source code of Winter Blues

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Winter Blues",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(21, 26, 164, 0)",
      "toolbar_text": "rgb(14, 14, 103)",
      "frame": "rgb(182, 213, 240)",
      "tab_background_text": "rgb(21, 26, 164)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(51, 150, 229)",
      "tab_line": "rgba(51, 150, 229, 0.6)",
      "popup": "rgba(51, 150, 229, 0.6)",
      "popup_text": "rgb(21, 21, 164)",
      "button_background_active": "rgb(182, 235, 245)",
      "button_background_hover": "rgba(36, 131, 207, 0.6)",
      "icons_attention": "rgb(255, 255, 255)",
      "icons": "rgb(21, 21, 164)",
      "ntp_background": "rgb(182, 213, 240)",
      "ntp_text": "rgb(36, 36, 195)",
      "popup_border": "rgb(100, 217, 239)",
      "sidebar_border": "rgb(21, 26, 164)",
      "sidebar_highlight_text": "rgb(21, 26, 164)",
      "sidebar_highlight": "rgb(100, 217, 239)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(51, 148, 229)",
      "tab_background_separator": "rgb(182, 235, 245)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(21, 26, 164)",
      "toolbar_field_border_focus": "rgb(21, 21, 164)",
      "toolbar_field_border": "rgb(21, 21, 164)",
      "toolbar_field_focus": "rgb(36, 36, 195)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(21, 21, 164)",
      "toolbar_field_separator": "rgb(21, 21, 164)",
      "toolbar_field_text_focus": "rgb(182, 235, 245)",
      "toolbar_top_separator": "rgba(21, 26, 164, 0)",
      "tab_loading": "rgba(51, 150, 229, 0.6)"
    }
  }
}