@b4cks4w I'm not having that problem over here, but that may be a distro issue. Which one are you running?
@MHS_Jenkins I tracked it down with about:process in FF to a Google Maps tab. Problem solved. Pretty surreal.
Pop!_OS, which is based on Ubuntu
Belay that! Not a bug per se. I looked at about:processes in firefox and voila: Google Maps devouring cpu and memory. Closed that tab and all is well.