We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

ابحث في الدعم

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

FF is using only 4 of the 8 cores in my CPU. Why isn't it using all 8?

  • 5 ردود
  • 3 have this problem
  • 4 views
  • آخر ردّ كتبه Burgomatic

more options

Task Manager shows that even when opening 15 pages in tabs, FF is still only using 4 out of the 8 cores in the CPU. Is FF made to utilize only 4-core CPUs?

Task Manager shows that even when opening 15 pages in tabs, FF is still only using 4 out of the 8 cores in the CPU. Is FF made to utilize only 4-core CPUs?

All Replies (5)

more options

Firefox does not need to use 8 cores. 4 cores is plenty for it. Even games don't need 8 cores. Max, games would need is 4 cores.

Modified by Microrobot

more options

Firefox is 32 bit if you want to use all 8 cores you can use a 64 bit variant of firefox such as

NOTE: Both of these versions of firefox are unstable and may combust.

Modified by kobe

more options

Maybe because Firefox is a 32-bit application on a 64-bit operating system? Just a WAG.

more options

There is no need for Firefox to be using all your cores, that would just be a waste of resources and energy.

more options

I agree that there's no need to use all cores, but I thought modern apps were made to use all available power. I didn't know that this was caused by FF being a 32-bit app.

Thank you all for your answers.