Your best bet would be to use the Private Browsing by PortableApps.com app, which uses your normal Firefox profile, but using special privacy settings.
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Your best bet would be to use the Private Browsing by PortableApps.com app, which uses your normal Firefox profile, but using special privacy settings.
https://portableapps.com/apps/internet/private_browsing
Part of the point is that it uses an entirely separate profile, unlike standard private mode.
Sometimes, the impossible can become possible, if you're awesome!