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Firefox In-Private session saves download history, how to delete?

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In-Private sessions are supposed to remain private. I opened Adobe Reader and under History is my history of In-Private sessions. They are greyed out more than .pdf files, and cannot be directly deleted. Firefox History shows nothing. Any advise on how to delete In-Private data? It seems to store somewhere. Firefox 46.0.1; Adobe Acrobat Reader

In-Private sessions are supposed to remain private. I opened Adobe Reader and under History is my history of In-Private sessions. They are greyed out more than .pdf files, and cannot be directly deleted. Firefox History shows nothing. Any advise on how to delete In-Private data? It seems to store somewhere. Firefox 46.0.1; Adobe Acrobat Reader

Chosen solution

Self Answered... Android 4.4.2 Settings (General Tab) Storage Cached Data Tap to Clear.

Problem was not an application issue, although In-Private is not as private as I thought. I used several different cache clearing tools, but none cleared the Download Manager data. Thanks. JG

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Chosen Solution

Self Answered... Android 4.4.2 Settings (General Tab) Storage Cached Data Tap to Clear.

Problem was not an application issue, although In-Private is not as private as I thought. I used several different cache clearing tools, but none cleared the Download Manager data. Thanks. JG