It is expected that AsyncOpen runs scripts, at least traditionally it has been. That is why DOM code for example has all these script runners
Bug 1851118 Comment 3 Edit History
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It is expected that AsyncOpen runs scripts, at least traditionally it has been. That is why DOM code for example has all these script runners https://searchfox.org/mozilla-central/rev/a7e33b7f61e7729e2b1051d2a7a27799f11a5de6/dom/html/HTMLImageElement.cpp#585-587