Examine source code of Jackal

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Jackal",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-013-06591d4ad28ab7b9ee90f62f81d6b505.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(147, 119, 116)",
      "toolbar_text": "rgb(255, 243, 243)",
      "frame": "rgb(157, 157, 157)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(169, 140, 138)",
      "toolbar_field_text": "rgb(43, 33, 32)",
      "tab_line": "rgb(159, 128, 126)",
      "popup": "rgb(63, 44, 44)",
      "popup_text": "rgb(255, 243, 243)",
      "tab_loading": "rgb(159, 128, 126)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4fe80dc1-7d48-4c6e-b9a7-058a176956c9}"
    }
  }
}