Examine source code of Blue Storm Animated Theme

{
  "name": "Silent Blue Storm Theme",
  "manifest_version": 2,
  "version": "2.1",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/rain.png"
      ]
    },
    "colors": {
      "frame": "rgba(19, 42, 55, 0.65)",
      "tab_background_text": "rgba(245, 248, 255, 1)",
      "toolbar": "rgba(19, 42, 55, 0.75)",
      "bookmark_text": "rgba(232, 214, 236, 1)",
      "toolbar_field": "rgba(48, 86, 115, 0.85)",
      "toolbar_field_text": "rgba(245, 248, 255, 1)",
      "tab_line": "rgba(152, 179, 212, 1)"
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9502f21a-923e-4636-b226-22a8807ad980}"
    }
  }
}