I did exactly as you suggested.

I clicked on custom. I gather SOMETHING was supposed to appear on my screen??

Nothing appeared.

So I went on the Internet and did a search on How to Make a browser a default browser, and

VOILA.

You bring up Firefox, you go to tools, you go to General, you see where it prompts you "Do you want to check if Firefox is your default browser?"

I clicked on this, it asked me if I wanted to make Firefox my default browser, and I clicked on yes.

The rest is history.

Guess what?? I finally figured out how to do SOMETHING on this darn computer, ALL BY MYSELF.

Alan is NOT THE ONLY MCGUYVER in this house!!!

lol