We don't want it. The built-in one works, it just needs to be fixed to work for non-loaded pages in large docs.
<rdar://problem/89301856>
Pull request: https://github.com/WebKit/WebKit/pull/3108
Committed 253226@main (cc7b06259688): <https://commits.webkit.org/253226@main> Reviewed commits have been landed. Closing PR #3108 and removing active labels.