Examine source code of Swift

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Swift",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(18, 28, 41)",
      "toolbar_text": "rgb(161, 210, 247)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(60, 75, 83)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(147, 193, 248)",
      "tab_line": "rgb(121, 172, 204)",
      "popup": "rgb(18, 28, 41)",
      "popup_text": "rgb(44, 130, 241)",
      "ntp_background": "rgb(24, 38, 57)",
      "sidebar_border": "rgb(13, 27, 30)",
      "sidebar_highlight_text": "rgb(134, 217, 255)",
      "sidebar_highlight": "rgb(3, 6, 7)",
      "sidebar_text": "rgb(158, 225, 255)",
      "sidebar": "rgb(26, 44, 49)",
      "tab_loading": "rgb(121, 172, 204)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d2a1f261-1209-4b2a-8486-2044944f4fc3}"
    }
  }
}