Examine source code of Heavenly_simple

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Heavenly",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(247, 247, 247)",
      "toolbar_text": "rgb(138, 138, 138)",
      "frame": "rgb(250, 250, 250)",
      "tab_background_text": "rgb(144, 144, 144)",
      "toolbar_field": "rgb(230, 230, 230)",
      "toolbar_field_text": "rgb(100, 100, 100)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(17, 17, 17)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(217, 218, 227)",
      "icons_attention": "rgb(62, 0, 255)",
      "ntp_background": "rgb(10, 10, 10)",
      "sidebar_border": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(250, 250, 250)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(17, 17, 17)",
      "tab_selected": "rgb(255, 255, 255)",
      "tab_text": "rgb(43, 43, 43)",
      "toolbar_bottom_separator": "rgb(240, 240, 240)",
      "toolbar_top_separator": "rgb(249, 249, 249)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e942b529-138b-4ab5-a8b6-972c7fe22f00}"
    }
  }
}