The tightened protections in Mojave are causing some trouble for the plugin process. We need to add the “com.apple.security.cs.allow-unsigned-executable-memory” entitlement to com.apple.WebKit.Plugin.64 to support things like Flash.
<rdar://problem/41120462>
Created attachment 342753 [details] Patch
Committed r232848: <https://trac.webkit.org/changeset/232848>