Multiple instances of Firefox
I have used Firefox for years with a short diversion to Chrome for a few months. Despite regular restarts the browser is slow. Today I have 4 tabs open but task manager shows 10 (and sometimes 20) instances of Firefox running. Can anyone help me figure out what is going on? Thanks in advance
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More than one process is normal for the current Firefox. http://www.ghacks.net/2016/07/22/multi-process-firefox/
Multi-process Firefox is codenamed "e10s". https://wiki.mozilla.org/Firefox/multiprocess
Start Firefox in Safe Mode {web link}
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
Fred, I started in safe mode. Currently have 6 tabs open and Task manager shows 8. What should my next step be? Thank you
You can check the Firefox Task Manager (about:performance) and about:memory pages.
- https://support.mozilla.org/en-US/kb/task-manager-tabs-or-extensions-are-slowing-firefox
- https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-or-cpu-resources
It is quite normal to see more Firefox processes running.
- one process for the main Firefox thread (user interface)
- one process for the compositor thread
- one process for the WebRender when this feature is enabled
- one or more content processes, see:
Options/Preferences -> General -> Performance
remove checkmark: [ ] "Use recommended performance settings" - extra privileged processes
You can find the current multi-process state on the Troubleshooting Information page (about:support).
- "Help -> Troubleshooting Information" -> "Application Basics":
Multiprocess Windows
Remote Processes
See also the Remote Processes section further down for more detail.