Examine source code of Fronting

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Fronting",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-038-6c77b9d7dc86f50c6cd82f9c9b1f36f0.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(150, 108, 68)",
      "toolbar_text": "rgb(186, 180, 208)",
      "frame": "rgb(32, 15, 7)",
      "tab_background_text": "rgb(152, 152, 98)",
      "toolbar_field": "rgb(150, 108, 68)",
      "toolbar_field_text": "rgb(53, 45, 68)",
      "tab_line": "rgb(152, 152, 98)",
      "popup": "rgb(32, 15, 7)",
      "popup_text": "rgb(186, 180, 208)",
      "tab_loading": "rgb(152, 152, 98)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d38cdbd2-ecd2-4fea-ad96-3de5b754c2b0}"
    }
  }
}