LibreWolf web browser may not be available in the official repository: apt search librewolf
Unable to locate package
But per the official page Installation on Debian based systems – LibreWolf it can be installed from a project’s repository:
sudo apt update && sudo apt install extrepo -y && sudo extrepo enable librewolf && sudo extrepo update librewolf && sudo apt update && sudo apt install librewolf -y
it worked for me and picked up my existing ~/.librewolf configuration.