Firefox 155 Available With Faster Page Loads Via Happy Eyeballs v3, QUIC v2 For HTTP/3

Firefox 155 introduces Happy Eyeballs v3, which now tries multiple connection paths concurrently including HTTP/2 and HTTP/3 alongside IPv4/IPv6, using modern DNS records to pick the fastest option. It also adds QUIC v2 support for HTTP/3 connections when servers support it. The release includes Smart Window, an AI-powered browsing window (initially limited to USA, Canada, France), a fix for a Linux sleep bug, plus developer-facing changes like WebAssembly Compact Import Section, WebAssembly Wide Arithmetic, the font-width CSS property, improved WebRTC interoperability, and the progress() CSS function.

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