You can disable plugin-container to see if that solves your problem. This article explains the function of plugin-container and how to disable it: http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins If you disable plugin-container #you must restart Firefox to close plugin-container that is already running #if one of the plugins managed by plugin-container crashes your whole browser will crash, not just the tab running the plugin