from top sites, selecting the URL causes browser to terminate using WebKit r65225 build. site's interface is Adobe Flash. browser was stable when opening site in previous build r64893. tested by deleting webkit install and reinstalling both builds. behavior as described per build.
I cannot reproduce this with a local debug build of r65392, even when opening from Top Sites. Could you please attach a crash log, as described in <http://webkit.org/quality/crashlogs.html>?
Mass closing plug-in bugs, as plug-in support has been removed from WebKit. Please comment and/or reopen if this still affects WebKit in some way.