Trump has always rambled incoherently. That isn’t new. His base loves him because he represents selfishness and racism. That is who they are. They don’t seem to care that he is a coward and a nutjob. Rich people love him because he will do just about anything for anyone who will publicly shine his shoes.
He’s a nitwit and he always has been.
Do you have any Amazon add-ons (extensions) installed in Firefox? Did you, or someone who uses your computer, install any software recently?
If it is a Firefox add-on causing the issue and you have more than one that could be the culprit, start by disabling all of them. If that fixes the issue, then it is just a matter of enabling each add-on (one at a time) to discover which one is causing the issue. When you figure out which one it is, uninstall it.