[FEAT] Add open a new private window manu

[rui8832]

Is this a new feature request?

• I have searched the existing issues

Wanted change

Add open a new private window manu.

Reason for change

I need a private window when debugging my web app.

Proposed code change

Add a menu item to the root/defaults/menu.xml file:

<item label="FireFox Private" icon="/usr/share/icons/hicolor/48x48/apps/firefox.png"><action name="Execute"><command>/usr/bin/firefox -private-window</command></action></item>

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[LinuxServer-CI]

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[github-actions]

This issue is locked due to inactivity