Examine source code of Rad Rad River

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Rad Rad River",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-007-ea06061a8f8be943739a27dace8dc532.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(68, 68, 68)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(98, 0, 6)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(38, 38, 38)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 0, 54)",
      "popup": "rgba(115, 0, 40, 0.89)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_selected": "rgb(177, 0, 37)",
      "tab_loading": "rgb(255, 0, 54)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8ad6fcca-8250-4924-96f8-b2e08802b8f6}"
    }
  }
}