Currently we have code in GtkLauncher and Epiphany to disable Flash. But flash is not the only plugin using GTK+ 2 symbols, and users may actually be using something like nspluginwrapper that shields the main browser process from the plugin. The opposite situation will eventually happen as well: WebKitGTK+ built with GTK+ 2 will encounter plugins using GTK+ 3. So we should be smarter and only disable plugins when we detect they use symbols from a different GTK+ version on them.
Created attachment 89153 [details] Patch
FWIW, it correctly ignores flash and java, and correctly loads flash through nspluginwrapper on my system =).
Comment on attachment 89153 [details] Patch Excellent.
Comment on attachment 89153 [details] Patch Clearing flags on attachment: 89153 Committed r83728: <http://trac.webkit.org/changeset/83728>
All reviewed patches have been landed. Closing bug.