Syncing, Exiting or Searching Firefox Lockwise (Android) Yields "java.lang.IllegalArgumentException: NetworkCallback was already unregistered"
To reproduce, unlock your AT&T Galaxy S8+ running Android 9 & have Firefox Lockwise connected to your device. Then, perform the following: # Open Lockwise through the app drawer # Try searching for a credential and hit the back button # Hit the back button again to exit the app # Witness crash of "java.lang.IllegalArgumentException: NetworkCallback was already unregistered" Also can occur during syncs, too.