Ad blocking apps that use the Content Blocker API are only compatible with Safari and the SFSafariViewController component, which is very feature-limited and not suitable for a full web browser app:Īs a workaround, Firefox Focus uses script injection to block ads and trackers within the browser part of itself, but the Content Blocker part of Firefox Focus only affects Safari: WKWebView does not support the Content Blocker API. As of 2017, Firefox Focus uses WKWebView as the webview component: The way Firefox Focus is implemented on iOS is a little complicated, since it's both a browser and a Content Blocker.
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