I used t/groff Memorandum Macros (mm) since college and my first years at work. I continue to use it to this day for quick documents. Although I enjoy writing with the MM set, it is hard to ignore the tools available in modern word processors.
Both have its use in my tool box although nowadays most of my writing at work is done in wiki like tools.
Thanks for the information. I have a 2011 MacBook Pro that has been "sunset" by Apple in which I know that I'm going to have the OS replaced. I have not reached the point in which I am having certificate problems in Safari probably because I am on Firefox most of the time. At least this handy guide let's me know that it's doable.