Why no program (App) to watch cox tv on PC

I have noticed that using the https://watchtv.cox.com/ and a web browser really uses up the processor resources on a PC. How I noticed this is I have had acouple of all in one computers that can play all kinds of dvds and online videos (youtube ect...) without a problem but using the https://watchtv.cox.com/ with firefox they have issues. I have used Chrome and it does better then firefox but I was wondering does cox have a program or App that can be used with a PC instead of having to use a web browser? They have the contour app (which I have used on cell phones and also a tablet) and it works perfectly so why can't there be something similar for a PC, like a standalone program and not a browser?