This is a know issue, there are two problems here: - We are dropping origin attributes in the permission manager (bug 1422056) - AFAIK all private browsing sessions use the same private browsing id Duping to bug 1422056, since that is probably going to make the biggest difference.
Bug 1546653 Comment 4 Edit History
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This is a known issue, there are two problems here: - We are dropping origin attributes in the permission manager (bug 1422056) - AFAIK all private browsing sessions use the same private browsing id Duping to bug 1422056, since that is probably going to make the biggest difference.