Firefox for Android allows extensions, you can use https://addons.mozilla.org/en-US/android/addon/ublock-origin/ https://addons.mozilla.org/en-US/android/addon/

Firefox for Android allows extensions, you can use https://addons.mozilla.org/en-US/android/addon/ublock-origin/ https://addons.mozilla.org/en-US/android/addon/ublock-origin... If your phone is a rooted Android, you can also use a hostfile that blacklists many ad servers, such as https://adaway.org/ https://adaway.org/ On iOS, "Content Blockers" for Safari can be used for ad blocking, and there is plenty of choice in the App Store.