I was able to reproduce this issue on all Firefox for Android versions: RC 119.0 build 2, Neta 119.0b9, and Nightly 120.0a1 from 10/23, with Xiaomi Mi8 Lite (Android 10). I've tested the pushalert.co/demo website. I'll attach a logcat as well, and confirm this issue.
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I was able to reproduce this issue on all Firefox for Android versions: RC 119.0 build 2, Neta 119.0b9, and Nightly 120.0a1 from 10/23, with Xiaomi Mi8 Lite (Android 10). I've tested the pushalert.co/demo website. I'll confirm this issue.