To hide X-Notifier statusbar icon
X-notifier options -> General -> Uncheck 'Show statusbar icon'
Note: The X-Notifier statusbar icon, at bottom of Firefox window,
is different from the main X-Notifier icon that is shown in toolbars at top of window.
To hide X-Notifier Toolbar
Mac user:
Firefox menu -> View -> Toolbars -> Uncheck 'X-notifier Toolbar'
Windows:
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