mozjexl is used on Android (by way of [FilterExpressions.sys.mjs](https://searchfox.org/mozilla-central/source/toolkit/components/utils/FilterExpressions.sys.mjs#8)) in [remote-settings.sys.mjs](https://searchfox.org/mozilla-central/rev/46d0387f0b582f00a5722c20d4e6b8693793631b/services/settings/remote-settings.sys.mjs#12). remote-settings.js is used inside GeckoView for all gecko-related RS collections (whereas the rust client in application-services is used for application code in android-components and fenix)
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mozjexl is used on Android (by way of [FilterExpressions.sys.mjs](https://searchfox.org/mozilla-central/source/toolkit/components/utils/FilterExpressions.sys.mjs#8)) in [remote-settings.sys.mjs](https://searchfox.org/mozilla-central/rev/46d0387f0b582f00a5722c20d4e6b8693793631b/services/settings/remote-settings.sys.mjs#12). remote-settings.sys.mjs is used inside GeckoView for all gecko-related RS collections (whereas the rust client in application-services is used for application code in android-components and fenix)