Please add the "Firefox Private Browsing" icon to the portable version of Firefox.
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It's a direct option within Firefox via clicking the 3 line menu and then New Private Window. I suppose I could add a manual shortcut launch ala the Thunderbird Portable Address Book launcher if folks really want it for some reason: https://portableapps.com/support/thunderbird_portable#addressbook
Sometimes, the impossible can become possible, if you're awesome!
I forgot I already created and published this a while back: https://portableapps.com/support/firefox_portable#private_window
Sometimes, the impossible can become possible, if you're awesome!