Examine source code of Cute Christmas Trees

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cute Christmas Trees",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(244, 200, 208)",
      "toolbar_text": "rgb(172, 53, 78)",
      "frame": "rgb(247, 227, 230)",
      "tab_background_text": "rgb(172, 53, 78)",
      "toolbar_field": "rgb(255, 244, 248)",
      "toolbar_field_text": "rgb(41, 85, 54)",
      "tab_line": "rgb(172, 53, 78)",
      "popup": "rgb(255, 244, 248)",
      "popup_text": "rgb(41, 85, 54)",
      "button_background_active": "rgb(249, 230, 234)",
      "toolbar_field_border": "rgb(172, 53, 78)",
      "tab_loading": "rgb(172, 53, 78)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{293b7b6d-1ec2-460e-b911-291ca4a11c9d}"
    }
  }
}