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I have issues with FireFox running YouTube on windows 10 - it gets super laggy - the issue is nonexistent if I used the Piped frontend. I think it depends a lot on what website you are using - some don’t play well with FireFox.
That being said, I did not have issues with FireFox on Mac when I used that, or on Linux, though I don’t use my Linux laptop a lot for web heavy stuff
Are you talking about the adapters that let you run network through your electrical circuits? Because that’s different from PoE. PoE is running power through the network cables so you get power and network with one plug, so kind of the opposite of that.
I can confirm that using electrical infrastructure for network is really not great.