Examine source code of Purple Spectrum

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Shades of Purple",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-009-f069b97f439938a011297c84464f0df6.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(255, 191, 248)",
      "toolbar_text": "rgb(63, 36, 80)",
      "frame": "rgb(192, 184, 255)",
      "tab_background_text": "rgb(26, 2, 40)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(120, 19, 238)",
      "tab_line": "rgb(168, 0, 201)",
      "popup": "rgba(206, 197, 255, 0.94)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(168, 0, 201)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0aeba492-5a23-4998-bc97-bfe63c1aa3ee}"
    }
  }
}