`y` and `p` in Firefox

[eiiot]

When I try to use the y and p commands in Firefox, I get the following message:

Copying and Pasting in Goolge Docs: These actions are unavailable using the Edit menus, but you can still use: ⌘C, ⌘X, ⌘V

Is there any way to fix this in non-chromium browsers? Perhaps implementing the suggested keybinds as opposed to using the menus?