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Re:Focus by Firefox, a Content Blocker for iOS by bydo on Tuesday December 08, 2015 @11:44AM (#10697500)
Safari and anything using the Safari View Controller. Which is, admittedly, a bit limited to use for a full custom browser.

The faster JS engine was also limited to Safari for a few iOS versions before it was extended to third-party applications, so perhaps they're taking the same approach here.

It's worth noting that they could also integrate their own ad blocking into their custom browser, which other third-party iOS browsers have been doing for years.

Re:Focus by Firefox, a Content Blocker for iOS by FussyZeus on Tuesday December 08, 2015 @12:32PM (#10697888)
Didn't know it also applied in the safari view controller. +1 Informative.