Firefox’s free VPN will offer 50 gigabytes of monthly data, which is pretty generous for a browser-based VPN. A Mozilla account is required to make use of it, which isn’t a hardship (they’re free), but is a point of friction some may wish to know upfront.
A VPN to me is a way to prevent my ISP from seeing I torrent and to go around geoblocks. It’s not a privacy tool at all. So yeah, I’m evaluating them from that angle.