Examine source code of Nightly 2.0

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nightly 2.0",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(38, 43, 90)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(35, 205, 179, 0)",
      "popup": "rgb(27, 40, 45)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(38, 43, 90)",
      "popup_border": "rgb(38, 43, 90)",
      "sidebar_border": "rgb(38, 43, 90)",
      "sidebar_highlight": "rgb(38, 43, 90)",
      "tab_loading": "rgba(35, 205, 179, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0e7919db-cc0e-4890-9a3b-665bc54030c4}"
    }
  }
}