Just use a custom user.js, LibreWolf doesn't deliver much beyond a few major tweaks and a logo.
I don't use or recommend exactly what they do but they have a long list of settings you might want to change that is better documented than any other source I've seen and if you click the wiki link there is detailed info about how user.js works.
https://gitlab.com/ac130kz/dotfiles/-/blob/main/configs/user...