Seems Defensio kind of blocked more than I initially intended by simply crashing and throwing all comments down the pipe. Until the problem is sorted out, I’ve simply disabled the plugin completely. Sorry for the inconvenience.
On a bright note: Recent Firefox nightly builds allow for proper, stable windowless Flash. Yes, that means Flash doesn’t crash anymore. Whoopy-doo. Be sure to use this nifty extension when using nightly builds. And don’t forget that you can edit your existing /usr/bin/firefox to simply use the new prefix (i.e. /opt/firefox) which is especially handy.