Examine source code of Gradient 5 - Winter Hues

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gradient 5 - Winter Hues",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(37, 37, 37, 0)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(22, 22, 22)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "popup_border": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgb(125, 125, 125)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f54a8261-6bbb-47fe-991e-df0e6a15bc10}"
    }
  }
}