The browser does not influence your download/upload speeds, with the exception of Tor, because it sends your traffic through a series of VPNs.

I don’t know what you measured, but it’s not the difference between browsers.

If you have vitamin deficiencies, fortified food can also cause you to run at 120%. In some countries (e.g. US) Noodles and flour are fortified with B-vitamins. Maybe that’s what you’re experiencing? It happened to me a few times.

What do you mean by email aliases?

That’s Japanese not Chinese.

And