Examine source code of Purple Night

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Purple Night",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(98, 102, 183)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(98, 102, 183)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(38, 23, 67)",
      "tab_line": "rgb(208, 178, 234)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(98, 102, 183)",
      "tab_loading": "rgb(208, 178, 234)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{84b55f9d-b4ee-4335-a54d-af6cad37fe40}"
    }
  }
}