What you see is what I call a nice glitch, and made wonder if there’s a way make new tab fonts the same as in my Debian system. Is there a css file to add or edit? Is it forbidden by Chromium?
Hello @VAPG1974
go to brave://settings/fonts and customize the font as you like
hope that help and have a nice day 
It does not work. I looked in some internal urls, and cannot be edited.