Examine source code of Endless Stars

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Endless Stars",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(31, 34, 61, 0)",
      "toolbar_text": "rgb(189, 174, 253)",
      "frame": "rgb(29, 0, 66)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgba(58, 42, 129, 0.7)",
      "toolbar_field_text": "rgb(189, 174, 253)",
      "tab_line": "rgba(205, 35, 185, 0)",
      "popup": "rgb(29, 0, 66)",
      "popup_text": "rgb(189, 174, 253)",
      "button_background_active": "rgb(58, 42, 129)",
      "button_background_hover": "rgb(42, 30, 95)",
      "icons_attention": "rgb(189, 174, 253)",
      "icons": "rgb(221, 210, 255)",
      "ntp_background": "rgb(29, 0, 66)",
      "ntp_text": "rgb(221, 210, 255)",
      "popup_border": "rgb(58, 42, 129)",
      "popup_highlight_text": "rgb(221, 210, 255)",
      "popup_highlight": "rgb(35, 22, 90)",
      "sidebar_border": "rgba(221, 210, 255, 0)",
      "sidebar_highlight_text": "rgb(221, 210, 255)",
      "sidebar_highlight": "rgb(58, 42, 129)",
      "sidebar_text": "rgb(221, 210, 255)",
      "sidebar": "rgb(29, 0, 66)",
      "tab_background_separator": "rgba(221, 210, 255, 0)",
      "tab_loading": "rgb(221, 210, 255)",
      "tab_selected": "rgba(58, 42, 129, 0.7)",
      "tab_text": "rgb(221, 210, 255)",
      "toolbar_bottom_separator": "rgba(221, 210, 255, 0)",
      "toolbar_field_border_focus": "rgba(58, 42, 129, 0)",
      "toolbar_field_border": "rgba(58, 42, 129, 0)",
      "toolbar_field_focus": "rgba(58, 42, 129, 0.9)",
      "toolbar_field_highlight_text": "rgb(221, 210, 255)",
      "toolbar_field_highlight": "rgb(96, 62, 194)",
      "toolbar_field_separator": "rgb(221, 210, 255)",
      "toolbar_field_text_focus": "rgb(221, 210, 255)",
      "toolbar_top_separator": "rgba(221, 210, 255, 0)",
      "toolbar_vertical_separator": "rgba(221, 210, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{df015260-8939-4067-a68c-55b73e0bc403}"
    }
  }
}