Comment 275 for bug 192888

The combination libflashsupport + nswrapper-conn2 + flash 9 is indeed the most stable one (for me). I think the current (perceived) instability of Firefox/Flash (note that most people wouldn't know the difference) in Hardy is a real problem. I wouldn't be surprised that this has been a dealbreaker for people trying Ubuntu.

Note to Robert Persson: nswrapper is originally meant to run x86 plugins in x64 environments. But it also has the benefit of 'sandboxing' plugins, so they don't crash the browser in case of a seg fault in the plugin. That's why the (I presume slightly modified) Conn version works: it doesn't fix the real issue, but it provides a nice workaround (i.e. limiting the crash effects -- and now negating them entirely).

I personally hope this workaround will soon be released; especially since the currently available versions are (very) unstable.