There is the AdBlock plugin for Firefox which you can get through the Firefox browser itself but that only works with Firefox. There is the AdBlock app which was pulled from the Play store but you can download and install from their site without root access. It acts as a proxy running on your device which you configure in your wireless settings. It will only work for a wireless connection and not a cell connection though and doesn't require root. Since my Note 8 is wireless only, I run it on there but don't use it on my phone since that is mostly cell connections.
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