I made the mistake of thinking that FF was using Chrome in recent updates (within the last couple of years), but it is actually using (Linux based) Gecko.
At least they got THAT right.
I haven’t used FF since they fired their conservative CEO a few years ago. (Shame.. I had used Mozilla since it was Netscape. I even stopped using Thunderbird :^( )
Brendan something. He basically invented javascript back when he worked with the netscape browser. After Mozilla, he went on to create the Brave browser.
My current browser is LibreWolf, a firefox fork based on security.