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Mozilla is launching a free built-in VPN on Firefox 149 — but with some conditions
(www.techradar.com)
This is a most excellent place for technology news and articles.
The VPN that Mozilla (Firefox) has sold for years was rebranded Mullvad. Assuming they'll still use Mullvad for this, I wouldn't worry.
EDIT: I've since seen somewhere else that Mozilla may not be using Mullvad for this, just to clear for anyone reading this later.