I think Midori looks somewhere lese - this is from Midori-faq:
Flash/ Netscape plugins don't work
You need to set MOZ_PLUGIN_PATH, for example like this:
export MOZ_PLUGIN_PATH="/usr/lib/mozilla/plugins:/opt/mozilla/lib/plugins"
You can either run that above line and run Midori in the same terminal afterwards or, for the long term, put it in ~/.bash_profile or /etc/profile.d or your respective distribution's place for this.