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CPU for Firefox in my Mac is abnormally high

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I've installed firefox and weirdly when I use youtube or just browsing the CPU is 250 and it's draining my new mac really quickly. This did not happen before on my previous mac. Seeking some help and answers, went to Apple genius bar and they've stated is the firefox application that is causing the fast drain of power.

I've installed firefox and weirdly when I use youtube or just browsing the CPU is 250 and it's draining my new mac really quickly. This did not happen before on my previous mac. Seeking some help and answers, went to Apple genius bar and they've stated is the firefox application that is causing the fast drain of power.
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Make sure hardware acceleration is enabled.

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile. Make sure you stay signed out of your sync account when testing.