Block ads in Firefox for iOS 
support.mozilla.org

Firefox for iOS has gotten a native ad blocker, with a fixed list based on EasyList. Better than nothing, but falling short of what a standalone solution offers: aside from the lack of customization, Firefox’s blocker doesn’t block ads in web search engines or the ones on the browser’s own homepage — Mozilla’s bread and butter. The rollout is gradual, meaning it may take a while to show up on your end.