Confirmed that the issue is extension related. Tried deleting ALL browsing data back to the beginning of time, multiple reboots, and other browsers. Finally worked after disabling all extensions.
Only change between yesterday (working) and today (not working) was a BitDefender update which may have also updated the BitDefender Anti-Tracker extension. In any case, disable extensions before doing any other troubleshooting as that appears to be the best fix.