The issue in comment 3 doesn't happen anymore, for what it's worth. Their website doesn't look substantially different aside from that (and they still list Firefox as unsupported, but don't seem to explicitly take action to block us). Not sure if their new experience (comment 7) has launched yet or not.
Bug 1898899 Comment 11 Edit History
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The modal-popup issue in comment 3 doesn't happen anymore, for what it's worth. Their website doesn't look substantially different aside from that (and they still list Firefox as unsupported, but don't seem to explicitly take action to block us). Not sure if their new experience (comment 7) has launched yet or not.