Thanks for reporting your solution to Flash lockups, which included reinstalling the Flash plugin after first doing a complete uninstall, including manual removal of leftover Flash files and folders. For the benefit of others reading, Adobe includes instructions for uninstalling Flash on Windows in their own help article (linked from the Flash Plugin - Keep it up to date and troubleshoot problems Firefox article) which is: http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html