final override fun onBackPressed() {

         supportFragmentManager.primaryNavigationFragment?.childFragmentManager?.fragments?.forEach {

             if (it is UserInteractionHandler && it.onBackPressed()) {

                 return

             }

 import mozilla.components.lib.state.ext.consumeFlow

 import mozilla.components.lib.state.ext.consumeFrom

 import mozilla.components.service.glean.private.NoExtras

 import mozilla.components.support.base.feature.ViewBoundFeatureWrapper

 import mozilla.components.support.ktx.kotlinx.coroutines.flow.ifChanged

 import org.mozilla.fenix.BuildConfig

 import kotlin.math.min

 @Suppress("TooManyFunctions", "LargeClass")

     private val args by navArgs<HomeFragmentArgs>()

     @VisibleForTesting

         // Elevation for undo toasts

         internal const val TOAST_ELEVATION = 80f

     }

 }