Is it possible to add a player through the injection of js into the site?

Question

JavaScript

The corporate MTS has the ability to listen to dispatchers' conversations to improve the quality of service. Virtual PBX at MTS is not bad, except that there is no built-in player for listening to audio recordings. You have to click on each file, download it and listen to it in the player. To solve the problem, I was looking for extensions for the Chrome browser. No results. I found one interesting extension that can change or supplement css and js for the site. Is it possible to add a player through the injection of js into the site?

Answer 1

Of course there is: GreaseMonkey/TamperMonkey + UserScript