People have been complaining about this since we removed it, as long as we have the web process extensions API there's no reason to not have this too.
Pull request: https://github.com/WebKit/WebKit/pull/29667
Committed 279899@main (e41ec2c29b8e): <https://commits.webkit.org/279899@main> Reviewed commits have been landed. Closing PR #29667 and removing active labels.