Examine source code of Waterfox Dark Improved

{
  "manifest_version": 2,
  "version": "2.1",
  "name": "Waterfox Dark Improved",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(45, 44, 42)",
      "toolbar_text": "rgba(255, 255, 255, 0.8)",
      "frame": "rgb(29, 29, 29)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(60, 60, 56)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0.8)",
      "popup": "rgb(45, 44, 42)",
      "popup_text": "rgba(255, 255, 255, 0.8)",
      "button_background_active": "rgba(0, 0, 0, 0.4)",
      "icons_attention": "rgba(255, 255, 255, 0.8)",
      "ntp_background": "rgb(45, 44, 42)",
      "ntp_text": "rgba(255, 255, 255, 0.8)",
      "sidebar_border": "rgba(60, 60, 56, 0.8)",
      "sidebar_text": "rgba(255, 255, 255, 0.8)",
      "sidebar": "rgb(45, 44, 42)",
      "tab_loading": "rgba(255, 255, 255, 0.8)",
      "tab_text": "rgba(255, 255, 255, 0.8)",
      "toolbar_field_border_focus": "rgb(47, 46, 43)",
      "toolbar_field_highlight": "rgba(255, 255, 255, 0.2)",
      "toolbar_field_separator": "rgba(255, 255, 255, 0.2)",
      "toolbar_top_separator": "rgba(45, 44, 42, 0.9)"
    }
  }
}