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Firefox 149 adds built-in free VPN with 50GB monthly data
(www.omgubuntu.co.uk)
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this post was submitted on 18 Mar 2026
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So if they were going to do an attack like this, they wouldn't do anything like the DH attack you're talking about, they'd have a custom CA in the browser's SSL root store. That root cert means they can generate a certificate for any website you visit, and that custom root cert would be how they decrypt your traffic.
Afaik there isn't a current attack on proper DH key pairings, but you can't block the custom certificate path at the browser level without some serious server side work/client side JS to validate