Examine source code of Purple evening

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Purple evening",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(122, 80, 255, 0.5)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(187, 102, 232)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(252, 225, 255)",
      "toolbar_field_text": "rgb(34, 0, 84)",
      "tab_line": "rgb(0, 255, 159)",
      "popup": "rgb(214, 205, 255)",
      "popup_text": "rgb(88, 0, 62)",
      "tab_loading": "rgb(0, 255, 159)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca4f4652-422d-4b0f-ac5d-249136c49b17}"
    }
  }
}