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

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

Firefox is slow. Often get the beachball. Have cleared history, caches, checked hard drive and reinstalled Firefox, with no change. What can I do?

  • 2 fhreagra
  • 1 leis an bhfadhb seo
  • 3 views
  • Freagra is déanaí ó cor-el

more options

Running on Mac 10.12.6. Not having a problem with any other application, including Safari.

Running on Mac 10.12.6. Not having a problem with any other application, including Safari.

All Replies (2)

more options

hi chaydgc, can you try to replicate this behaviour when you launch firefox in safe mode once? if not, maybe an addon is interfering here...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

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.


You can create a new profile to test if your current profile is causing the problem.

See "Creating a profile":

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.