We Built the Proxy Behind Firefox's New Built-In VPN — Here's How It Works

Firefox 149, released by Mozilla on March 24th, introduced a free built-in VPN that requires no additional software and features a simple toggle to mask users' IP addresses. The underlying infrastructure of this VPN is based on the MASQUE protocol, which uses QUIC to enable efficient and secure proxy services without revealing user activity to intermediaries. This architecture allows multiple independent data streams within a single connection, minimizing disruptions caused by packet loss, and supports both TCP and UDP traffic. Mozilla's choice of Fastly as its proxy partner is based on Fastly's capacity to handle large-scale traffic and its commitment to user privacy, with no commercial incentives to track or share user data. The incorporation of MASQUE in Firefox's VPN is part of a broader initiative to embed privacy features directly into the browser, heralding a shift toward more secure, native internet privacy solutions.

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