Examine source code of poly-greens

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "poly-greens",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "center top",
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(112, 131, 157, 0.22)",
      "toolbar_text": "rgb(252, 228, 252)",
      "frame": "rgb(112, 131, 157)",
      "tab_background_text": "rgb(95, 253, 248)",
      "toolbar_field": "rgba(191, 255, 235, 0.48)",
      "toolbar_field_text": "rgba(0, 47, 114, 0.62)",
      "tab_line": "rgb(169, 255, 0)",
      "popup": "rgba(65, 92, 152, 0.74)",
      "popup_text": "rgb(181, 251, 224)",
      "button_background_active": "rgb(0, 81, 110)",
      "button_background_hover": "rgb(99, 187, 193)",
      "icons_attention": "rgb(95, 253, 248)",
      "icons": "rgb(255, 252, 145)",
      "ntp_background": "rgb(112, 131, 157)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_highlight_text": "rgb(95, 253, 248)",
      "popup_highlight": "rgb(113, 123, 200)",
      "sidebar_border": "rgb(0, 81, 110)",
      "sidebar_text": "rgb(197, 82, 190)",
      "sidebar": "rgb(181, 251, 224)",
      "tab_background_separator": "rgb(237, 141, 214)",
      "tab_loading": "rgb(191, 255, 253)",
      "tab_text": "rgb(255, 252, 145)",
      "toolbar_bottom_separator": "rgb(180, 248, 106)",
      "toolbar_field_border_focus": "rgb(0, 169, 238)",
      "toolbar_field_border": "rgba(191, 255, 235, 0.1)",
      "toolbar_field_highlight_text": "rgb(255, 253, 200)",
      "toolbar_field_highlight": "rgb(182, 164, 215)",
      "toolbar_field_separator": "rgb(255, 255, 255)",
      "toolbar_field_text_focus": "rgba(0, 47, 114, 0.62)",
      "toolbar_top_separator": "rgb(180, 248, 106)",
      "toolbar_vertical_separator": "rgb(169, 255, 0)"
    }
  }
}