Mozilla doesn't go about it in as upfront way as Brave does, IME, but stuff like VPN, Pocket and other browser-related services I mind not at all.
I have no sympathy to the current political shitfest that Mozilla is as an organization, but as makers of Firefox I feel like Mozilla is in an impossible bind: Their users expect a fairytale of an independent, donation-funded browser that people spontaneously adopt, and go nuts about stuff like the inclusion of Pocket. I know, I used to be one of those people back when Pocket was introduced. But reeing about Mozilla trying to have independent funding by giving people useful services is just strange. It's exactly what they should be doing, and Brave setting up revenue streams like Talk and Search is great. Especially because they operate in the normal money universe for those of us who aren't terribly enthusiastic about crypto.