[tjpnz]

Something similar happened to me a few years back after I accidentally tapped an ad in Chrome (an ad delivered by Google no less). While I didn't get infected the site did start displaying system like prompts (my phone was also vibrating at this point and playing the same sound I get when there's a natural disaster) saying my device was infected and that I should tap OK to download an apk.

I did several things after this:

- Reported the ad to Google (no followup from their side - naturally).

- Removed Chrome.

- Installed Firefox and uBlock Origin.

[aembleton]

How did you remove Chrome?

[literallycancer]

You can disable system apps so they don't show up even without root. If you have root you can also uninstall them. Just open a terminal, su and use pm uninstall to uninstall for your user or all users (you can reinstall the same way if you end up needing it later). No reason to use the provided Chrome when you can just use Bromite though.