hello, in order to close a facebook account, please refer to their support section: https://www.facebook.com/help/224562897555674 in order to stop ads on firefox for android, you could use one of the few available addons in that sector, like ''bluehell firewall'' (less demanding on resources), ''ublock origin'' or ''adblock plus'': https://addons.mozilla.org/android/extensions/security-privacy