Add firebase packages to allowed import prefixes
diff --git a/lib/src/flutter_web.dart b/lib/src/flutter_web.dart
index b47856e..a95768d 100644
--- a/lib/src/flutter_web.dart
+++ b/lib/src/flutter_web.dart
@@ -35,7 +35,11 @@
   }
 
   static const Set<String> _flutterImportPrefixes = {
-    'package:flutter',
+    'package:cloud_firestore/',
+    'package:firebase/',
+    'package:firebase_auth/',
+    'package:firebase_core/',
+    'package:flutter/',
     'dart:ui',
   };