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marius.blog / Hacker News
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2026-09-03 / HACKER NEWS
Packet Capture on Firefox 155 Shows the AI Kill Switch Leaves Telemetry, Ads and Affiliate Prefetch Untouched
Marius Quabeck retested Firefox 155.0 (released September 1) with Wireshark 4.2.2 on a clean Ubuntu 24.04.3 install, decrypting TLS via SSLKEYLOGFILE across two fresh profiles running identical cold-start, setup, 120-second idle and fixed-browsing scenarios. With AI blocked, Firefox contacted the same nine TLS hosts at idle and sent identical telemetry POSTs carrying the same client IDs and usage UUIDs as the default profile, and kept DNS-prefetching the affiliate tracker temuaffiliateprogram.pxf.io. The switch now covers eleven preferences, up from nine, but AI infrastructure requests fire on first launch before a user can reach it.
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