Examine source code of Retro Amber

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Retro Amber",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(35, 35, 35)",
      "toolbar_text": "rgb(207, 155, 0)",
      "frame": "rgb(10, 10, 10)",
      "tab_background_text": "rgb(168, 126, 0)",
      "toolbar_field": "rgb(10, 10, 10)",
      "toolbar_field_text": "rgb(168, 126, 0)",
      "tab_line": "rgba(255, 191, 0, 0.5)",
      "popup": "rgb(50, 50, 50)",
      "popup_text": "rgb(207, 155, 0)",
      "tab_loading": "rgba(255, 191, 0, 0.5)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{47d564bd-9a92-4d63-9ab9-b70c126e45d3}"
    }
  }
}