Catalina browser shortcut fail?

i'm using command-\, and nothing is happening.
it says i'm running 2.1.4.
nothing seems to happen at all when i hit command-\ or command-period in safari.
command-period in firefox is working but oh, boy, having different shortcuts is going to become a problem, and command-period in particular, as it is has been used in other places on macs for 35 years as a shortcut for canceling an operation...