How to control audio playback in Mozilla Firefox on Linux Mint using hotkeys?

Question

Browsers

I want to configure Mozilla's audio start/pause control by hotkey in Linux.
I will describe more precisely with an example: in Linux, I set up control from any window by pressing the key (if it is important - "/"). I'm used to working with VLC this way, but I don't know how to set it up with Mozilla.
More precisely, I'm interested in pausing / continuing the playback of a voice message in VK.
How to set up this functionality? I guess that it is possible to write a script, but the knowledge is so small that I mostly program in the "ctrl+c ctrl+v" way.