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Firefox opening in the background on its own, on startup and consuming high amount of CPU

  • 1 reply
  • 1 has this problem
  • Last reply by strafy

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Every time I switch on my laptop, I found that it was heating up without opening anything. I open the task manager and I see that Firefox is running and using a huge amount of the CPU and apparently consuming a lot of the battery as well. Firefox is not there in my startup list. I have reinstalled and installed multiple times. I have tried changing toolkit.winRegisterApplicationRestart to false. I have tried changing browser.tabs.remote.autostart to false.

If I do open Firefox now, without ending the task that is already running, and then close it later, it is still running in the background. Only way to stop this task running is to end task and I have to do it every time I switch on my Laptop.

I hope I have described the problem well, please let me know what other details I can provide. I am putting a screenshot of the task running as well. Thanks in advance

Attached screenshots

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The behavior sounds like what a malware would do. Run a malware scan and see if it picks up anything suspicious.

Someone else had a similar problem to you. You can see the resolved thread here:


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