Safari extensions were introduced to iOS in September 2021. The list of Essential Safari Extensions, Selected by App Store editors (see attached screenshot) appears to be exactly the same as it was back in 2021 and hasn't been updated since then.

In the new iOS 26 beta, Safari Extensions Settings now shows Recommendations (see attached screenshot) drawn from the list of Essential Safari Extensions. This makes it even more important to update this vastly out of date list.
