Though I will dig into today, probably this is not related to APZ since we [don't enable APZ in popups which is not remote browsers](https://searchfox.org/mozilla-central/rev/08013752b4638f01d41d2a38ca7bd741bc572c86/widget/nsBaseWidget.cpp#841). The menu doesn't look like it has a remote browser.
Bug 1705085 Comment 6 Edit History
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Though I will dig into today, probably this is not related to APZ since we [don't enable APZ in popups which do not have remote browsers](https://searchfox.org/mozilla-central/rev/08013752b4638f01d41d2a38ca7bd741bc572c86/widget/nsBaseWidget.cpp#841). The menu doesn't look like it has a remote browser.