I haven't been getting any push notifications from MacRumors for a while now. They are enabled in Safari Preferences, so I'm not sure what else I can do on my end.
I've been having issues too and will try deleting those files.
But just as side note, the permissions.plist under that directory list xeeno.com (I believe a server name?), but under that entry, besides macrumors.com, there're also entries fro "fackechris.com" and "fakejun.com". Are these normal?