Examine source code of Purple Spectrum Expanded

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Purple Spectrum Expanded",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(182, 162, 241)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(37, 40, 166)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(101, 119, 161)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(162, 0, 255)",
      "popup": "rgba(17, 19, 2, 0.92)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(22, 197, 120)",
      "button_background_hover": "rgb(255, 104, 192)",
      "frame_inactive": "rgb(110, 55, 139)",
      "icons_attention": "rgb(221, 29, 112)",
      "icons": "rgb(4, 2, 4)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgba(255, 255, 255, 0.94)",
      "popup_border": "rgb(11, 0, 255)",
      "popup_highlight_text": "rgb(0, 0, 0)",
      "popup_highlight": "rgba(255, 255, 255, 0.94)",
      "sidebar_border": "rgb(251, 251, 251)",
      "sidebar_highlight_text": "rgb(84, 86, 177)",
      "sidebar_highlight": "rgb(154, 217, 182)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(0, 0, 0)",
      "tab_background_separator": "rgb(0, 148, 136)",
      "tab_loading": "rgba(13, 20, 253, 0.94)",
      "tab_selected": "rgb(251, 246, 255)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgba(0, 40, 8, 0.96)",
      "toolbar_field_border_focus": "rgb(86, 196, 130)",
      "toolbar_field_border": "rgb(70, 32, 181)",
      "toolbar_field_focus": "rgb(0, 0, 0)",
      "toolbar_field_highlight_text": "rgba(255, 255, 255, 0.92)",
      "toolbar_field_highlight": "rgb(27, 16, 63)",
      "toolbar_field_separator": "rgba(54, 184, 117, 0.92)",
      "toolbar_field_text_focus": "rgb(225, 247, 255)",
      "toolbar_top_separator": "rgb(0, 81, 33)",
      "toolbar_vertical_separator": "rgba(81, 0, 221, 0.81)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ed2c103-f70c-49f9-ae2d-25115bcbf476}"
    }
  }
}