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This will match the behavior of ARM64 Linux (bug 1861847) and Chrome reporting their CPU architecture as "Linux x86_64": https://www.chromium.org/updates/ua-reduction/#sample-ua-strings-phase-5 Goals: 1. Reduce fingerprintable entropy exposed to web content. Few websites should need to distinguish 32-bit x86 Linux users from x86_64 Linux users. One of the few that did was Mozilla's own Firefox download page and it has now been updated to use distro packages instead of sniffing the UA string to offer Mozilla's architecture-specific installer binaries. (See bugs https://github.com/mozilla/bedrock/issues/12966 and https://github.com/mozilla/bedrock/issues/14012.) 2. Reduce risk of webcompat problems from websites not recognizing unexpected CPU architectures. (Example: in bug 1861847, YouTube treated ARM64 Linux as a mobile device) This "freezeCpu" pref controls this UA string code path: https://searchfox.org/mozilla-central/rev/1f27a4022f9f1269d897526c1c892a57743e650c/netwerk/protocol/http/nsHttpHandler.cpp#931-937 The UA string tests already check the "freezeCpu" pref to test for either "Linux x86_64" or the actual CPU architecture: https://searchfox.org/mozilla-central/rev/f602853ba8d55ba157e2a74d9b571615f6ed97b8/browser/components/resistfingerprinting/test/browser/browser_navigator.js#41-47,51 Differential Revision: https://phabricator.services.mozilla.com/D207238 |
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