Major browser differences

   This is the specifics of the first time i encountered this problem 
due to menu choices NOT seen when referring to a received letter.
   Win 7.1 OS, desktop computer, not to be confused with a so-called 
smartphone.

   Using Firefox 80.0.1:
   Log into Humana.com, see a bar "myhmana", then a menu bar
     (house icon)Home, (bell icon)Mesages, (spyglass icon)I want to.., 
Menu(down arrow)

   Using Google Chrome 84.0:
   Log into Humana.com, see a bar "myhmana", (square cluster of dots), 
More Humana then a menu bar
     (house icon), Coverage(down arrow), Claims(down arrow), 
MyHeath(down arrow), Billing, (bell icon), (typical person icon)Account

   Major differences.

   What the heck? Firefox that buggy?
   Repairs/upgrades available?

   Thanks