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Hundreds of blocked cookies that used to be in my "exceptions" privacy list are now gone/erased. Where did they go? Where on my computer is the list?

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Hundreds of blocked cookies and "allow for session only" cookies that used to be in my "exceptions" privacy list are now gone/erased. Where did they go? Where on my computer is the list? This list tooks years to accumulate and I tried to find the file that contained the list so I could save it or copy it but I never could. Is this list somewhere on my computer so I can restore it?

Hundreds of blocked cookies and "allow for session only" cookies that used to be in my "exceptions" privacy list are now gone/erased. Where did they go? Where on my computer is the list? This list tooks years to accumulate and I tried to find the file that contained the list so I could save it or copy it but I never could. Is this list somewhere on my computer so I can restore it?

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I found that after Firefox v29, a LOT of my settings and
add-ons were changed / reset. Try this; Start Firefox in Safe Mode
While you are in safe mode;
Firefox Options > Advanced > General.
Look for and turn off Use Hardware Acceleration.
Then check ALL of your settings. Browser and add-ons. Then restart.

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Did you clear the Site Preferences?

You would need an (older) copy of the permissions.sqlite file that stores the website specific exceptions.