I can confirm this works for me with the latest download, coded 112006 or 9.0.21.78. I had a Flash Player Beta installed when I initially reported this bug, coded 101806 or 9.0.21.55. That version worked with Firefox, but not with Liferea. It's possible that I had it installed in /usr/lib/firefox/plugins/ but not /usr/lib/mozilla/plugins, so older versions may work as well.
In summary, the fix is: 1) Download Flash Player 9 "Installer for Linux" from http://labs.adobe.com/downloads/flashplayer9.html 2) Unpack the tarball. It produces a directory containing libflashplayer.so and readme.txt. 3) Close Mozilla, Firefox, and Liferea. 4) Copy libflashplayer.so to /usr/lib/firefox/plugins and /usr/lib/mozilla/plugins (alternatively, to .mozilla/plugins) 5) Restart Mozilla, Firefox, or Liferea. YouTube-arific! -- Crashes on loading a post with embedded Flash https://launchpad.net/bugs/69537 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs