First, the author recommends using Firefox if only because:
A non-profit giving away free software makes sense. Some of the biggest companies in the world giving away free software is suspicious.
Then he recommends several browser extensions, some of which are available for Firefox ONLY.
He personally likes and uses StartPage for Firefox's search engine, though he considers DuckDuckGo just as good. Note that:
[Both of t]hese search engines are still ad-driven, but they are generic ads around your search terms, not targeted to you in any way or aware of your information. It's a straightforward business model that I can trust, so I have no reason to think they are tracking me and lying about it.
Switch DNS to 18.104.22.168 when possible. I can do this on my MacBook Pro easily enough, but on my iPhone this is problematic.
Be a Good Netizen
Be sure to turn off uBlock Origin and Smart Referer for sites that you value, as those likely provide valuable revenue and analytics for them.