Firefox for Android's Play Integrity check hits custom ROMs
(https://i0.wp.com/www.omgubuntu.co.uk/wp-content/uploads/2025/11/mozilla-slop.jpg?resize=406%2C232&ssl=1) Mozilla has added support for Google's Play Integrity API, known for blocking users of custom ROMs from accessing banking apps, to Firefox for Android. Per a resolved issue in Mozilla's public tracker, a new lib-integrity-googleplay library was added to Firefox's Android codebase. It requests a Play Integrity token which is then passed to Mozilla's MLPA (Machine Learning Proxy) server. The token is used to access Firefox's server-side AI tools, like Smart Window, for rate-limiting purposes, ensuring only unmodified, Play-installed copies of Firefox on Google-certified devices use Mozilla's compute infra. Per documentation for the API, developers can: "...call the Integrity API [...] to [...]
You're reading Firefox for Android's Play Integrity check hits custom ROMs (https://www.omgubuntu.co.uk/2026/06/mozilla-firefox-android-google-play-integrity) , a blog post from OMG! Ubuntu (https://www.omgubuntu.co.uk) . Do not reproduce elsewhere without permission.
Categories: News, Android, Mozilla
Source: https://www.omgubuntu.co.uk/2026/06/mozilla-firefox-android-google-play-integrity Jun 09, 2026, 11:55 PM