Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

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.

Why Firefox Has Spikes In CPU Usage And Consumes A Lot Of RAM Since Security Update?

  • 1 reply
  • 12 have this problem
  • 13 views
  • Last reply by John99

Boris_yo
Boris_yo
more options

After applying security update 3.6.18 i started having this problem. I had this problem earlier but it only happened after several days Firefox was opened constantly. Now i have this problem several hours later after launching Firefox.

Here is a picture of high RAM usage

Here is a picture of high RAM and CPU usage

I have Flash disabled.

What is going on? Should i reinstall Firefox 3.6.18?

After applying security update 3.6.18 i started having this problem. I had this problem earlier but it only happened after several days Firefox was opened constantly. Now i have this problem several hours later after launching Firefox. [http://i.stack.imgur.com/PJmH5.png '''Here is a picture of high RAM usage'''] '''[http://i.stack.imgur.com/tjsqt.png Here is a picture of high RAM and CPU usage]''' I have Flash disabled. What is going on? Should i reinstall Firefox 3.6.18?

Modified by Boris_yo

All Replies (1)

John99
John99
more options

Have you any particular reason for using an older version of Firefox.

Whilst I rarely use firefox 3.6 now, and do not know the answer I will comment that the now unsupported firefox 4 did have bad memory problems in some cases. Some of those problems were addressed in firefox 5, and others are addressed in Firefox 7, which is due out on the Aurora channel next week.

You could consider upgrading to a newer version of firefox. If you need firefox3.6 only for limited use you could consider using Firefox portable, alongside a newer version of Firefox.