gpd-configurations/home/user/xdg.nix

{
    xdg = {
        enable = true;
        mimeApps = {
            enable = true;
            defaultApplications = {
                "x-scheme-handler/http" = "io.gitlab.librewolf-community.desktop";
                "x-scheme-handler/https" = "io.gitlab.librewolf-community.desktop";
            };
        };
    };
}