WebKit is just the part that renders web content. Browser makers are free to include plugin functionality in their implementation if they want to, including con

WebKit is just the part that renders web content. Browser makers are free to include plugin functionality in their implementation if they want to, including content blockers like ad-block, fancy tab and theme functionality, etc. It is also possible to extend the content blocking feature, so it also works in Safari itself through a regular web plugin or a content blocker extension. DuckDuckGo offers the "DuckDuckGo Privacy Essentials" plugin for iOS and macOS, blocking all kinds of trackers.