20 Firefox's private browsing will not let me use add on

When 20 of Firefox has been downloaded, he had private browsing. Since then, I've lost my appearance add on. If I take private appearance navigation add on will come back on. How can I have them both?

Seriously? You voluntarily want to alienate some of your users?

How bout you tell us how to get back to 19 Firefox and then disable the auto-update, which would help a lot since I wouldn't have to "make a choice."

Tags: Firefox

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