Firefox for iPhone Now Blocks Ads: How to Use the New Ad-Blocking Tool

The feature is optional, but it won't work for search engine results or Mozilla-powered ads. Firefox for iOS now comes with a built-in ad blocker to hide select online advertisements when browsing the web on your iPhone or iPad. The feature was introduced on Aug. 15, but Mozilla says it remains an “experimental” tool, meaning it's gradually rolling out to all …