Putting old operating systems online.....pretty sure the browser is the least of such worries.

...Congratulations, you moved to a Chrome clone with an inbuilt advertisement service, a cryptocurrency, and a significant set of controversies?

Shows you know nothing but regurgitated info.
Ads are blocked by default (haven't seen a Youtube ad in ages), advertising is opt-in and cryptocurrency is an optional reward you can sign up for if you do choose to opt-in. E.g., getting paid for being shown ads. Their search is also pretty good and I have swapped over to it pretty much exclusively.

As far as "controversies" go, maybe you should look into Firefox and the Mozilla foundation in more detail if you care about that :)

Is Brave not using Google Chrome rendering engine?
Does it not include a built-in advertisement system?
Is it not backed by a crypto-currency?
Has its main developer not being touched by many controversies due to its reactionary political stances?

I don’t see anything but cold hard facts in the message you’re answering to. Well, maybe the "Congratulations" at the beginning might lean a bit more into opinion territory, but this is the only non-factual word in the whole message.

Supermium is also a great browser for Windows 7 and other much older Windows operating systems. I recommended it here a while back: https://www.gog.com/forum/general/supermium_a_great_browser_for_windows_7_d

However, I must say that the latest release (132.0.6834.226 R5.01) has been causing 100% CPU usage while browsing, and it's making browsing incredibly slow! I don't know if this is on my end or a bug. r3dfox doesn't cause this behavior all the time, so I don't know... But r3dfox doesn't use the Chromium engine, so maybe that's it.

As simple true/false statements, sure. But missing on key context, like all of it being opt-in and thus essentially irrelevant to the end user.

The only statement that was sufficient by itself was that it is indeed Chrome based.