For #2952 - Delete All Tabs should run on Main Thread

app/src/main/java/org/mozilla/fenix/browser/BrowserFragment.kt

@@ -727,10 +727,11 @@ class BrowserFragment : Fragment(), BackHandler, CoroutineScope {
     }
 
     private fun getSessionById(): Session? {
+        val components = context?.components ?: return null
         return if (customTabSessionId != null) {
-            requireContext().components.core.sessionManager.findSessionById(customTabSessionId!!)
+            components.core.sessionManager.findSessionById(customTabSessionId!!)
         } else {
-            requireComponents.core.sessionManager.selectedSession
+            components.core.sessionManager.selectedSession
         }
     }
 

app/src/main/java/org/mozilla/fenix/settings/DeleteBrowsingDataFragment.kt

@@ -220,7 +220,9 @@ class DeleteBrowsingDataFragment : Fragment(), CoroutineScope {
         }
     }
 
-    private fun deleteTabsAsync() = async(Dispatchers.IO) { requireComponents.core.sessionManager.removeSessions() }
+    private fun deleteTabsAsync() = async(Dispatchers.Main) {
+        requireComponents.useCases.tabsUseCases.removeAllTabs.invoke()
+    }
 
     private fun deleteBrowsingDataAsync() = async(Dispatchers.IO) {
         requireComponents.core.engine.clearData(Engine.BrowsingData.all())