I can still reproduce this issue: STR: - Open normal window. - Open private window. - From normal window, install a static theme. - Check the private window, for the install confirmation pop-up.
Bug 1533519 Comment 4 Edit History
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I can still reproduce this issue on Firefox 67.0a1 (20190312095443) under Win 7 64-bit and Mac OS X 10.14.1: STR: - Open normal window. - Open private window. - From normal window, install a static theme. - Check the private window, for the install confirmation pop-up.