Hi If you have download Firefox for Android to your device to erase malware, you may have been given some incorrect guidance. Firefox for Android is a web browser, not an anti-malware tool. If you have downloaded an anti-malware app from the Google Play Store, you will need to open the app and (typically) run a scan of your device for it to pick up any malware and provide guidance and tools on its removal. I hope this helps, but if not, please come back here and we can look into a different solution for you.