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Brave browser quietly slips a VPN service onto your Windows PC
(www.androidcentral.com)
This is a most excellent place for technology news and articles.
So? There is no way for the vast majority of users to read or understand the source for something like Firefox - to the point it may as well be closed source. Agreed of course plenty of security researchers will be examining the code which they can't with Vivaldi - but presumably if that was a security advantage Firefox would have less vulnerabilities when compared to other browsers. (Actually would be interested to see if this is the case!)