Examine source code of Sunset Forest River

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Sunset Forest River",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-018-0ca3dfc7bb661ec53999d358812ce0ab.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(238, 186, 146)",
      "toolbar_text": "rgb(122, 42, 31)",
      "frame": "rgb(81, 72, 28)",
      "tab_background_text": "rgb(195, 136, 145)",
      "toolbar_field": "rgb(250, 220, 181)",
      "toolbar_field_text": "rgb(120, 87, 56)",
      "tab_line": "rgb(122, 42, 31)",
      "popup": "rgb(250, 220, 181)",
      "popup_text": "rgb(120, 87, 56)",
      "button_background_active": "rgb(81, 72, 28)",
      "button_background_hover": "rgb(191, 147, 111)",
      "frame_inactive": "rgb(122, 42, 31)",
      "icons_attention": "rgb(195, 136, 145)",
      "icons": "rgb(122, 42, 31)",
      "ntp_background": "rgb(250, 220, 181)",
      "ntp_text": "rgb(120, 87, 56)",
      "popup_border": "rgb(81, 72, 28)",
      "popup_highlight_text": "rgb(120, 87, 56)",
      "popup_highlight": "rgb(212, 237, 231)",
      "sidebar_border": "rgb(81, 72, 28)",
      "sidebar_highlight": "rgb(212, 237, 231)",
      "sidebar_text": "rgb(120, 87, 56)",
      "sidebar": "rgb(250, 220, 181)",
      "tab_text": "rgb(81, 72, 28)",
      "toolbar_bottom_separator": "rgb(81, 72, 28)",
      "toolbar_field_border": "rgb(81, 72, 28)",
      "toolbar_field_focus": "rgb(250, 220, 181)",
      "toolbar_field_highlight_text": "rgb(120, 87, 56)",
      "toolbar_field_highlight": "rgb(212, 237, 231)",
      "toolbar_field_separator": "rgb(81, 72, 28)",
      "toolbar_field_text_focus": "rgb(120, 87, 56)",
      "toolbar_top_separator": "rgb(241, 219, 192)",
      "tab_loading": "rgb(122, 42, 31)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{af3328d2-8127-4d28-8cad-c06f3fa0a947}"
    }
  }
}