This will only stop messages for your current visit of a site. Stop annoying alert messages in Chrome iOS Suppress Dialogue once Personally, I use Safari with Adblock for Mobile by BETAFISH INC (Free) and Purify by Chris Aljoudi ($2.99AUD). Option 2: Switch to Safari and install a content blocker
In Feb 2018, Google started blocking intrusive ads on Computer and Android, unfortunately not yet on iOS. These are two major annoyances that people experience browsing the web.