(In reply to Hiroyuki Ikezoe (:hiro) from comment #19) > Indeed, it changes the associated nsIWidget. So [this](https://searchfox.org/mozilla-central/rev/dc4560dcaafd79375b9411fdbbaaebb0a59a93ac/layout/xul/nsMenuPopupFrame.cpp#2221) is the EnsureWidget call in question? Yes, this bug happened by there.
Bug 1635769 Comment 21 Edit History
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(In reply to Hiroyuki Ikezoe (:hiro) from comment #19) > Indeed, it changes the associated nsIWidget. So [this](https://searchfox.org/mozilla-central/rev/dc4560dcaafd79375b9411fdbbaaebb0a59a93ac/layout/xul/nsMenuPopupFrame.cpp#2221) is the EnsureWidget call in question? Yes, this bug happened there.