Examine source code of tonic smile

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "tonic smile",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(225, 234, 239)",
      "toolbar_text": "rgb(12, 14, 22)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(47, 49, 47)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(11, 14, 61)",
      "tab_line": "rgb(25, 218, 88)",
      "popup": "rgb(217, 222, 222)",
      "popup_text": "rgb(18, 18, 41)",
      "ntp_background": "rgb(166, 187, 186)",
      "tab_loading": "rgb(25, 218, 88)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e1c6ab2-c968-421a-9b76-7dc2f792aa04}"
    }
  }
}