It only shows up on Firefox.
When I hover over the object it shows something about a search for President and Michelle and the last thing I can see is gzip.
I don’t have Java installed on this computer.
I ran a full system scan and Malwarebytes but didn’t find any threats.
That is the Webshield telling you it blocked (aborted) the connection to a dangerous page.
Avast stopped anything getting to your machine. 
So it’s nothing to be concerned about?
No, you are quite safe, avast did what it is meant to do.
Thank you AdrianH
I was getting ready to uninstall Firefox.
I forgot to mention that the only time I get this popups are when I’m on the forum.