Cannot change the parameters, they are grayed out

I am in my account on Firefox version 38.0.5 and when I go into my settings, I need to change the but they are grayed out. How do I get this so I can edit them? I went into the preferences of Firefox, then down to privacy and want to make some changes, but some areas such as clear history when you close Firefox is gray. How can I make changes in Firefox?

Thank you all who replied to me.

You have a check mark on the mode of private browsing permissions setting ('always to use the private browsing mode').

You exit PB to be able to use all the settings that are currently blocked.

Tags: Firefox

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