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Why is Firefox CPU usage high?

Super User Asked by zylstra on November 2, 2020

I have uBlock Origin and Privacy Badger installed, in addition to several other add-ons, on both Chrome and Firefox. Firefox uses much more CPU on Reddit’s homepage than does Chrome. (I do not know if Firefox uses more CPU on other pages yet.)

I tried deactivating all add-ons; the CPU usage remained high.

I tried reinstalling Firefox; the CPU usage remained high.

Any ideas to reduce CPU usage?

One Answer

Without any concrete data, all I can offer is general advice for the moment.

Check out about:performance to see how resources are being used by your tabs and browser addons.

If you're still suspicious that something's not right, it may be worth creating a new blank Firefox profile for comparison.

Answered by BoffinBrain on November 2, 2020

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