Examine source code of Amethyst (Dark)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Amethyst (Dark)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.5)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(134, 88, 212)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(81, 52, 130, 0.95)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(134, 88, 212)",
      "popup": "rgba(81, 52, 130, 0.95)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(134, 88, 212)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{81bb40e3-2d4e-459f-81a6-29b691fe2850}"
    }
  }
}