Throttling certain connection for a computer behind NAT

There is a video stream which is 24x7 on. Firefox plays it back and unfortunately keeps going into HD mode which is not desirable, causing gigabytes of unwanted traffic. I have not found any way to fix it into a lower quality in client computer. Thus I'm thinking about throttling it in my FreeBSD router. IPFW can do it, but there is more than one remote IP address which must be throttled, complicating the setup. I have NATD running, but my understanding is there is no throttling option. Ideas how to do it with least pain are welcome. Thanks.
 
There is a video stream which is 24x7 on. Firefox plays it back and unfortunately keeps going into HD mode which is not desirable, causing gigabytes of unwanted traffic. I have not found any way to fix it into a lower quality in client computer. Thus I'm thinking about throttling it in my FreeBSD router. IPFW can do it, but there is more than one remote IP address which must be throttled, complicating the setup. I have NATD running, but my understanding is there is no throttling option. Ideas how to do it with least pain are welcome. Thanks.
Doesn't Firefox have a web developer console that allows you to set a speed throttle?
 
Thank you both. Yes, streamlink is available. Looking how to access that developer console now ...
 
I just learned there is a Firefox Throttle extension, probably the easiest solution. Will check it out now.
 
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