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Firefox uses 100% CPU when watching youtube in private window

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Firefox in general uses a lot of CPU but when I watch youtube video in private window, the CPU usage goes to 100%. Why does it use so much CPU? I am using the latest version.

Firefox in general uses a lot of CPU but when I watch youtube video in private window, the CPU usage goes to 100%. Why does it use so much CPU? I am using the latest version.

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What are you working with? see screenshot Show the issue. What video are you watching and what resolution? Do you have the same issue with Firefox in Safe Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode

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