This seems similar to your two earlier questions: * [https://support.mozilla.org/questions/1083873 Hello, I would like to use the Firefox browser in my mobile. But I find no antivirus app that protects firefox.] * [https://support.mozilla.org/questions/1084002 Antivirus and Malware protection] For future reference, you can revive a thread by adding a comment instead of starting a new one each time. I'm not aware of any antivirus add-ons for Firefox for Android, but there are many security apps for Android. I can't say I've researched in detail, but over the years I've tried these: * Lookout - https://play.google.com/store/apps/details?id=com.lookout&hl=en * CM Security - https://play.google.com/store/apps/details?id=com.cleanmaster.security&hl=en * Trend Micro Mobile Security - https://play.google.com/store/apps/details?id=com.trendmicro.tmmspersonal&hl=en