I have used Firefox for years. When I go to options > Home, I have my new tab set to “blank page” instead of the default “Firefox Home”. So far I haven’t seen any promotional material.
Found out it showed up as a “snipet” message from Mozilla. Turned off the display of the “snipet” and it went away.
Don’t care.
It showed they have joined the racist indoctrination crowd. So that’s it for me.
I verified Firefox Home is the culprit. Blank Page gets rid of the BLM/SJW crap.