Firefox.exe* uses the large amount of cpu, 40-50%

My computer slows down and the Task Manager shows firefox.exe* very high CPU usage.

You can try disabling OMTC and leave hardware acceleration in active Firefox.

  • topic: config page: layers.offmainthreadcomposition.enabled = false

You can open the topic: config page via the address bar.
You can accept the warning and click on "I'll be careful" to continue.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem.

  • Put yourself in the DEFAULT theme: Firefox/tools > Modules > appearance
  • Do NOT click on the reset button on the startup window Mode safe

You can check if there is an update for your display driver graphic card and search for hardware acceleration of related issues.

Tags: Firefox

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