http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins --- Try to disable IPC. You can set the prefs dom.ipc.plugins.enabled.* to '''false''' on the about:config page to disable the plugin-container process to see if that helps. '''dom.ipc.plugins.enabled.npswf32.dll''' (Flash) '''dom.ipc.plugins.enabled.npctrl.dll''' (Silverlight) '''dom.ipc.plugins.enabled.npqtplugin.dll''' (QuickTime) To open the ''about:config'' page, type '''about:config''' in the location (address) bar and press the Enter key, just like you type the url of a website to open a website. If you see a warning then you can confirm that you want to access that page. Double-click each of those prefs to toggle them to false, then restart Firefox.