Available Space on My Computer Disappearing for No Reason

I have been sitting in front of my computer for the last 20 minutes and in that time my available GB went from 27.4 to 26.75. The space available keeps slowly diminishing. The only program I have running now is  Firefox, I closed everything else, I am not downloading anything. And yet something is eating space in my computer!
Any thoughts on what I can do?

Download from the Internet OmniDiskSweeper (frew) and open it.  It will show you all of your files and the respective sizes.  Compare the totals with what you find in Disk Utility.
Open Activity Monitor and examine what applications are open and see if that gives you a clue what may be transpiring. 
Ciao.

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