Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

High CPU Usage with Firefox While in Background

  • 2 replies
  • 0 have this problem
  • 2 views
  • Last reply by zeroknight

moofk2002
moofk2002
more options

Hi Firefox,

Every time I leave the browser open in the background, I come to find that it's using almost 80% of my CPU, and my fans are very loud. I don't know what this is. I deleted Google Chrome because of that, and then I used Microsoft Edge for a while. Then I figured out that it's full of bugs, and the same goes for Brave. So, I decided to give Firefox a shot, only to find out that it's just like Google Chrome. I don't have any extensions installed on my browser except for IDM (download manager). Please, can you answer me and tell me why this is happening, or should I just delete the browser and maybe try Opera?

Hi Firefox, Every time I leave the browser open in the background, I come to find that it's using almost 80% of my CPU, and my fans are very loud. I don't know what this is. I deleted Google Chrome because of that, and then I used Microsoft Edge for a while. Then I figured out that it's full of bugs, and the same goes for Brave. So, I decided to give Firefox a shot, only to find out that it's just like Google Chrome. I don't have any extensions installed on my browser except for IDM (download manager). Please, can you answer me and tell me why this is happening, or should I just delete the browser and maybe try Opera?
Attached screenshots

All Replies (2)

Terry
Terry
more options

Some web pages will have that effect, such as pages which continually add new content. I suggest using an extension to unload a page while you are not actually using it.

https://addons.mozilla.org/firefox/addon/auto-tab-discard/

See also

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-or-cpu-resources

zeroknight
zeroknight
more options

You can get more information about what is happening with the Firefox Task Manager (Shift+Esc).

Run a malware scan with something like Malwarebytes to make sure your system is not infected.