Here's how firefox describes plugin-container [0]: Plugins are loaded separately from Firefox, allowing the main Firefox process to stay open if a plugin crashe

Here's how firefox describes plugin-container [0]: Plugins are loaded separately from Firefox, allowing the main Firefox process to stay open if a plugin crashes. This is different than a sandbox. A sandbox limits what the plugin is capable of doing to the system. The whole point of sandboxing flash is that it has had numerous security holes. 0. https://support.mozilla.org/en-US/kb/what-is-plugin-container https://support.mozilla.org/en-US/kb/what-is-plugin-containe...