Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox 56.02 keeps iMac with Mavericks OS 10.9.5 from sleeping. Why?

  • 1 cavab
  • 1 has this problem
  • 14 views
  • Last reply by cor-el

more options

When Firefox 56.02 is open, my iMac running Mavericks OS 10.9.5 will not automatically go into a sleep mode. When Firefox 56.02 is closed, the computer automatically sleeps when it is supposed to. Why is this happening? How do I fix the problem?

When Firefox 56.02 is open, my iMac running Mavericks OS 10.9.5 will not automatically go into a sleep mode. When Firefox 56.02 is closed, the computer automatically sleeps when it is supposed to. Why is this happening? How do I fix the problem?

All Replies (1)

more options

You can try to modify multi-process settings to see if this has effect.

  • set dom.ipc.processCount to 1 if it is currently set to a higher value (4)
  • disable multi-process windows in Firefox

You can disable multi-process windows in Firefox by setting these prefs to false on the about:config page.

  • browser.tabs.remote.autostart = false
  • browser.tabs.remote.autostart.2 = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.