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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?

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2 Answers 2

Reset to default
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What worked for me was reducing the size of the disk cache. It was 1GB initially but I set it to 50MB. On the about:config page look for browser.cache.disk.capacity and set the value you want in KB.

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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.

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