This will match Chrome Android's UA string. As part of Chrome’s UA reduction, Google froze the Android OS version exposed in Chrome’s UA string to "10". Google finished rolling out that change in Chrome 110 in May 2023: https://www.chromium.org/updates/ua-reduction Goals: 1. Reduce fingerprintable entropy passively exposed to the web. 2. Reduce risk of webcompat breakage for new Android OS versions. Differential Revision: https://phabricator.services.mozilla.com/D194686