I think this is due to a misunderstanding of the way urlparser uses lists. By default, the Mozilla list is used, which includes domains like firebaseapp.com. This is not an IANA TLD, but a Mozilla Public Suffix List TLD, hence my confusion. To use IANA root domains, just pass it to the listname parameter (i.e. listname="iana"). It really all depends on your use case.
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