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.

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 hangs periodically with 100% CPU. All add-ons and plug-ins disabled.

  • 2 replies
  • 12 have this problem
  • 3 views
  • Last reply by z00mantwo

more options

FireFox is hanging on me periodically with 100% CPU usage. I have every add on and plugin disabled. In safe mode I don't have the problem. Not sure what to do next since I've disabled all add-ons and plug-ins.

FireFox is hanging on me periodically with 100% CPU usage. I have every add on and plugin disabled. In safe mode I don't have the problem. Not sure what to do next since I've disabled all add-ons and plug-ins.

Modified by z00mantwo

Chosen solution

Okay I fixed this by turning off "Use hardware acceleration when available" in the "Advanced" Options. I did have to restart FireFox for the change to take effect.

Read this answer in context 👍 3

All Replies (2)

more options

Note that the "SYSTEM DETAILS" were collected while in Safe Mode.

more options

Chosen Solution

Okay I fixed this by turning off "Use hardware acceleration when available" in the "Advanced" Options. I did have to restart FireFox for the change to take effect.

Modified by z00mantwo