Mozilla VPN is currently experiencing an outage. Our team is actively working to resolve the issue. Please check the status page for real-time updates. Thank you for your patience.

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

Firefox using 50%+ of the CPU when it is inactive & only stops when I close & reopen it; then it starts it again after it is loaded for a while.

  • 3 ردود
  • 88 have this problem
  • 1 view
  • آخر ردّ كتبه Borne

more options

With Firefox loaded but sitting inactive for a period, it starts to use 50%+ of the CPU (per Windows Task Manager). This slows down everything even though there is nothing (overtly) going on with Firefox. If I close & reopen it, it is OK for a while, and then it starts again.

== In the past week, but I know of no specific event out of the usage ordinary.

With Firefox loaded but sitting inactive for a period, it starts to use 50%+ of the CPU (per Windows Task Manager). This slows down everything even though there is nothing (overtly) going on with Firefox. If I close & reopen it, it is OK for a while, and then it starts again. == In the past week, but I know of no specific event out of the usage ordinary.

All Replies (3)

more options

الحل المُختار

more options

I found the reason being the company web filter blocking one of my plugins. To test it you look for a plugin that is not working right and uninstalling it.

more options

Thank you for the link "AnonymousUser"... but the link no longer works.

I have been having this same issue for months now. It seems like at random times FF just jumps up to 50% CPU usage and basically freezes (very slow), and I have to restart it.

Sometimes when restarting FF it still does it, so I have to restart again.