Extensions and themes can cause Firefox to use more system resources than it normally would. To determine if an extension or theme is causing Firefox to use too many resources, start Firefox in Troubleshoot Modeand observe its memory and CPU usage. In Troubleshoot Mode, extensions and themes are … See more The latest Firefox version may include performance improvements. Update Firefox to the latest release. See more Firefox may grind to a halt due to operating system issues, such as a pending Windows update,that can be resolved by … See more Firefox may use more system resources if it's left open for long periods of time. A workaround for this is to periodically restart Firefox. You … See more Many web pages have content you don't need, but which still use system resources to display its content. Firefox's built-in content blocking can help save resources by preventing third … See more WebFirefox 99 uses 100% of one CPU core when idling I've only just noticed this recently with Firefox 99. It seems a few others have been having the same issues. about:performance shows that none of the open tabs or extensions are using the CPU. about:processes shows the main Firefox process is hogging the CPU.
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