The list was wrong. Of all the highly compatible well tested well supported browsers out there Firefox is definitely at the top of the list for being honest and safe.
I use brave because I like its features, but The CEO is kind of an ass and they're as likely to spy on you and sell your data as Google or Microsoft is.
But the article is total garbage, Firefox is totally fine to use. If you want something better, check out LibreWolf, it removes the telemetry, Sponsored sites, Pocket, etc. and adds privacy features. It also comes with uBlock Origin preinstalled. They even have an official Lemmy community: !librewolf@lemmy.ml