Examine source code of Purple Gradient

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Purple Gradient",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(13, 0, 28)",
      "toolbar_text": "rgb(253, 253, 253)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(244, 244, 244)",
      "toolbar_field": "rgb(25, 25, 25)",
      "toolbar_field_text": "rgb(253, 253, 253)",
      "tab_line": "rgba(248, 60, 0, 0.44)",
      "popup": "rgb(25, 25, 25)",
      "popup_text": "rgb(253, 253, 253)",
      "tab_loading": "rgba(248, 60, 0, 0.44)"
    }
  }
}