One thing to watch out for is that FreeBSD ports/pkg is a "rolling release", where most 3rd party applications & libraries are updated frequently, as opposed to

One thing to watch out for is that FreeBSD ports/pkg is a "rolling release", where most 3rd party applications & libraries are updated frequently, as opposed to every 2 years for Ubuntu. The upshot is that you'll want to just update firefox, and it will want to remove and re-install 57 packages. I personally run the quarterly packages to avoid the churn as much as I can. This is somewhat similar to Ubuntu, except "major" updates happen every 3 months.