(https://librewolf.net/installation/debian/)
We have a repository for Debian-based distributions (Debian, Ubuntu, Mint, etc.), with which you can easily install and update LibreWolf. To add it to your system and install LibreWolf, run the following commands one by one:
sudo apt update && sudo apt install extrepo -y
sudo extrepo enable librewolf && sudo extrepo update librewolf
sudo apt update && sudo apt install librewolf -y