Examine source code of Chocolate Calculator

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Chocolate Calculator",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-030-0f935cfde055600d01a959c5c15353de.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(94, 138, 138, 0.67)",
      "toolbar_text": "rgb(241, 217, 193)",
      "frame": "rgb(82, 64, 46)",
      "tab_background_text": "rgb(212, 188, 167)",
      "toolbar_field": "rgb(101, 100, 100)",
      "toolbar_field_text": "rgb(247, 219, 203)",
      "tab_line": "rgb(91, 89, 90)",
      "popup": "rgb(82, 64, 46)",
      "popup_text": "rgb(241, 217, 193)",
      "tab_loading": "rgb(91, 89, 90)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a72821b0-c8b8-45ef-883a-0a83d326e2ba}"
    }
  }
}