Problem description: The flash plugin just keeps crashing, I have also tried the adobe flash 11.5 version, makes no sense! The webpages cannot load properly now, like YouTube, not to mention videos. I have no Real Player installed, I have followed the protectmode=0 suggestions as well.
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
Do not click the Reset button on the Safe mode start window or otherwise make changes.