It is quite normal to see more Firefox processes running. *one process for the main Firefox thread (user interface) *one or more content processes, see:<br>Options/Preferences -> General -> Performance<br>remove checkmark: [ ] "Use recommended performance settings" *one process for the compositor thread *one process for the WebRender when this feature is enabled Current releases may use additional processes for features like extensions. See also the sidebar on the <b>about:memory</b> page. You can find the current multi-process state on the Troubleshooting Information page (about:support). *"Help -> Troubleshooting Information" -> "Application Basics":<br>Multiprocess Windows<br>Remote Processes See also the Remote Processes section further down for more detail.