Examine source code of Autumn Leaps In

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Autumn Leaps In",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 198, 0.81)",
      "toolbar_text": "rgb(255, 51, 51)",
      "frame": "rgb(255, 255, 198)",
      "tab_background_text": "rgb(255, 132, 41)",
      "toolbar_field": "rgb(255, 255, 156)",
      "toolbar_field_text": "rgb(140, 195, 61)",
      "tab_line": "rgb(255, 255, 156)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(186, 14, 14)",
      "button_background_active": "rgb(255, 255, 156)",
      "button_background_hover": "rgb(255, 255, 255)",
      "icons_attention": "rgb(255, 255, 156)",
      "icons": "rgb(255, 51, 51)",
      "ntp_background": "rgba(255, 255, 198, 0.8)",
      "ntp_text": "rgb(255, 132, 41)",
      "popup_border": "rgb(140, 195, 61)",
      "popup_highlight": "rgb(255, 255, 156)",
      "sidebar_border": "rgb(255, 51, 51)",
      "sidebar_highlight_text": "rgb(216, 250, 166)",
      "sidebar_highlight": "rgba(255, 255, 198, 0.8)",
      "sidebar_text": "rgb(140, 195, 61)",
      "sidebar": "rgb(252, 252, 216)",
      "tab_background_separator": "rgb(186, 14, 14)",
      "tab_loading": "rgb(255, 51, 51)",
      "tab_selected": "rgb(255, 255, 198)",
      "tab_text": "rgb(255, 51, 51)",
      "toolbar_bottom_separator": "rgb(255, 156, 74)",
      "toolbar_field_border_focus": "rgb(255, 51, 51)",
      "toolbar_field_border": "rgb(186, 14, 14)",
      "toolbar_field_focus": "rgb(255, 255, 156)",
      "toolbar_field_highlight_text": "rgb(140, 195, 61)",
      "toolbar_field_highlight": "rgb(255, 255, 156)",
      "toolbar_field_separator": "rgb(255, 255, 156)",
      "toolbar_field_text_focus": "rgb(76, 121, 12)",
      "toolbar_top_separator": "rgb(140, 195, 61)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c4ff0427-d1c1-4cbd-8075-dd13b2cb2ae3}"
    }
  }
}