As @Azzu@lemm.ee said at another comment:
Crashes for me, too:
Second failure launching org.mozilla.firefox/org.mozilla.fenix.customtabs.ExternalAppBrowserActivity, giving up
android.os.TransactionTooLargeException: data parcel size 614820 bytes
at android.os.BinderProxy.transactNative(Native Method)
at android.os.BinderProxy.transact(BinderProxy.java:571)
at android.app.IApplicationThread$Stub$Proxy.scheduleTransaction(IApplicationThread.java:2746)
at android.app.servertransaction.ClientTransaction.schedule(ClientTransaction.java:136)
at com.android.server.wm.ClientLifecycleManager.scheduleTransaction(ClientLifecycleManager.java:47)
at com.android.server.wm.ActivityTaskSupervisor.realStartActivityLocked(ActivityTaskSupervisor.java:880)
at com.android.server.wm.RootWindowContainer.startActivityForAttachedApplicationIfNeeded(RootWindowContainer.java:2000)
at com.android.server.wm.RootWindowContainer.$r8$lambda$auelgeOhCvbItmS_07q5VFEb1ac(Unknown Source:0)
at com.android.server.wm.RootWindowContainer$$ExternalSyntheticLambda2.apply(Unknown Source:8)
at com.android.internal.util.function.pooled.PooledLambdaImpl.doInvoke(PooledLambdaImpl.java:318)
at com.android.internal.util.function.pooled.PooledLambdaImpl.invoke(PooledLambdaImpl.java:204)
at com.android.internal.util.function.pooled.OmniFunction.apply(OmniFunction.java:78)
at com.android.server.wm.ActivityRecord.forAllActivities(ActivityRecord.java:4270)
at com.android.server.wm.WindowContainer.forAllActivities(WindowContainer.java:1430)
at com.android.server.wm.WindowContainer.forAllActivities(WindowContainer.java:1423)
at com.android.server.wm.RootWindowContainer.lambda$attachApplication$15$RootWindowContainer(RootWindowContainer.java:1978)
at com.android.server.wm.RootWindowContainer$$ExternalSyntheticLambda20.accept(Unknown Source:6)
at com.android.server.wm.Task.forAllRootTasks(Task.java:3197)
at com.android.server.wm.WindowContainer.forAllRootTasks(WindowContainer.java:1806)
at com.android.server.wm.WindowContainer.forAllRootTasks(WindowContainer.java:1806)
at com.android.server.wm.WindowContainer.forAllRootTasks(WindowContainer.java:1806)
at com.android.server.wm.WindowContainer.forAllRootTasks(WindowContainer.java:1806)
at com.android.server.wm.WindowContainer.forAllRootTasks(WindowContainer.java:1806)
at com.android.server.wm.WindowContainer.forAllRootTasks(WindowContainer.java:1806)
at com.android.server.wm.WindowContainer.forAllRootTasks(WindowContainer.java:1799)
at com.android.server.wm.RootWindowContainer.attachApplication(RootWindowContainer.java:1964)
at com.android.server.wm.ActivityTaskManagerService$LocalService.attachApplication(ActivityTaskManagerService.java:6041)
at com.android.server.am.ActivityManagerService.attachApplicationLocked(ActivityManagerService.java:4595)
at com.android.server.am.ActivityManagerService.attachApplication(ActivityManagerService.java:4676)
at android.app.IActivityManager$Stub.onTransact(IActivityManager.java:2404)
at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2517)
at android.os.Binder.execTransactInternal(Binder.java:1179)
at android.os.Binder.execTransact(Binder.java:1143)