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Why does "Private Window" theme appear for a moment when Firefox starts in normal window?

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When I change the "Private Window" theme using extension, "Private Window" theme appear for a moment when Firefox starts in normal window. Is it normal?

Extension, for example: Purple Private Windows.

When I change the "Private Window" theme using extension, "Private Window" theme appear for a moment when Firefox starts in normal window. Is it normal? Extension, for example: Purple Private Windows.

Modified by user1526367

All Replies (2)

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? I know this question is not relevant here. If this is a bug, please report it yourself. my English is not good.

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I reported this bug in bugzilla.