Haskell package open-browser is a dependency of Stack (and Cabal (the tool)) and was last uploaded to Hackage in January 2016. Its sole recorded Hackage maintainer is rightfold. I’ve emailed the recorded maintainer email, but had no response. The recorded ‘home page’ GitHub repository does not exist. There is a rightfold user on GitHub, but none of its six public repositories are Haskell-related and activity starts in 2019.
On the assumption that the package has been abandoned, I am willing to take it over.
Following Hackage policy, I am stating my intention here, before ‘waiting a while’.