My apologies; I know this isn't an issue with iceberg per se... but just wanted to raise it here to get an official reply. I stumbled onto this Firefox theme just earlier, calling itself the "Iceberg Dark Theme". That might be fine, but when you look at the "support site" link, it lists https://cocopon.github.io/iceberg.vim/ as the support site?
But as far as I can tell, this firefox theme is not affiliated.