Android]HTC One+[ Firefox browser re-direct

Something in my phone is redirecting my browser to adcash.com and some nonsensical popup warning. From things like Interpol warns about a new virus and asks me to download and run an app (obviously fake) to other equally random things. Avast! Does not find anything and I dont know how to scan a phone or remove viruses manually.

try to clear crap with CCleaner https://play.google.com/store/apps/details?id=com.piriform.ccleaner

it may help clearing browser cache… or uninstall / reinstall browser

avast mobile products forum section https://forum.avast.com/index.php?board=66.0

Avast FAQ https://www.avast.com/en-eu/faq.php

FAQ videos https://www.avast.com/en-eu/faq.php?q=video#searchForm

Thank you although I could not find anything overtly deviant from the scan. Ill just satisfy myself with a factory reset.