Examine source code of Willow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Willow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-017-7074520d97b5c592d413aed5f115f093.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(149, 191, 170)",
      "toolbar_text": "rgb(135, 105, 76)",
      "frame": "rgb(135, 105, 76)",
      "tab_background_text": "rgb(157, 178, 105)",
      "toolbar_field": "rgb(255, 206, 148)",
      "toolbar_field_text": "rgb(115, 92, 65)",
      "tab_line": "rgb(115, 92, 65)",
      "popup": "rgb(255, 206, 148)",
      "popup_text": "rgb(115, 92, 65)",
      "button_background_active": "rgb(161, 222, 9)",
      "button_background_hover": "rgb(130, 181, 156)",
      "icons_attention": "rgb(161, 222, 9)",
      "icons": "rgb(255, 206, 148)",
      "ntp_background": "rgb(157, 178, 105)",
      "ntp_text": "rgb(115, 92, 65)",
      "popup_border": "rgb(115, 92, 65)",
      "popup_highlight_text": "rgb(161, 222, 9)",
      "tab_loading": "rgb(161, 222, 9)",
      "tab_text": "rgb(115, 92, 65)",
      "toolbar_field_focus": "rgb(157, 178, 105)",
      "toolbar_field_highlight": "rgb(149, 191, 170)",
      "toolbar_field_text_focus": "rgb(115, 92, 65)",
      "toolbar_vertical_separator": "rgb(255, 206, 148)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e9f9c84-2789-48af-bdd7-937e2f52e4a3}"
    }
  }
}