Examine source code of Black Rain (Recustomized)

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Black Rain (Recustomized)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/pixelrain.gif"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(10, 12, 33)",
      "toolbar_text": "rgb(142, 74, 201)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 207, 237)",
      "toolbar_field": "rgba(0, 0, 0, 0.42)",
      "toolbar_field_text": "rgb(255, 0, 201)",
      "tab_line": "rgb(255, 0, 201)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(142, 74, 201)",
      "ntp_background": "rgb(10, 12, 33)",
      "ntp_text": "rgb(253, 68, 182)",
      "popup_border": "rgb(255, 0, 201)",
      "popup_highlight_text": "rgb(255, 207, 237)",
      "sidebar_highlight_text": "rgba(0, 0, 0, 0.42)",
      "sidebar_highlight": "rgba(0, 0, 0, 0.42)",
      "sidebar": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgb(255, 0, 201)",
      "toolbar_field_border": "rgb(255, 0, 201)",
      "toolbar_field_focus": "rgb(0, 0, 0)",
      "toolbar_field_separator": "rgb(255, 0, 201)",
      "toolbar_field_text_focus": "rgb(255, 0, 201)",
      "toolbar_top_separator": "rgb(255, 0, 201)",
      "tab_loading": "rgb(255, 0, 201)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{112067fc-d243-4d4f-88fb-54143e1d67de}"
    }
  }
}