Now that WebKitGTK+ 2.4 and 2.5 are parallel installable, since they use different versions of the plugins cache, apps using 2.4 might override the plugins cache file. We should prevent this from happening by making older versions use the plugin cache, but not downgrade it.
Created attachment 237072 [details] Patch
Committed r172920: <http://trac.webkit.org/changeset/172920>