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.

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 goes from 7% to 50% of CPU activity-slows down?

  • 1 reply
  • 3 have this problem
  • 1 view
  • Last reply by Morbus

more options

After several minutes, I slow down and then get no response when on Firefox. IE, AOL works OK. I close with task mangr. Slect Firefox and it goes from using 7% of CPU to 50% according to Reliability and Performance Monitor on Vista Business

This happened

Every time Firefox opened

== maybe 10 days ago

After several minutes, I slow down and then get no response when on Firefox. IE, AOL works OK. I close with task mangr. Slect Firefox and it goes from using 7% of CPU to 50% according to Reliability and Performance Monitor on Vista Business == This happened == Every time Firefox opened == maybe 10 days ago

All Replies (1)

more options

Check for faulty extensions. In my experience, some webpages will cause Firefox to use up a lot of CPU cycles, but only when some extensions are installed.