Microsoft finally fixes 5 year old Windows Defender high CPU bug on Mozilla Firefox April 10, 2023 by admin Tweet Microsoft and Mozilla have managed to fix a five year old bug in Windows Defender which was causing relatively high CPU usage on Firefox compared to other browsers like Chrome and Edge. Read more… Neowin Related Posts:Microsoft Defender apparently causing high memory…Windows 11 Build 22622.450 (KB5015890) brings…Firefox vs Chrome: Mozilla finally manages to trump…Two years after Chrome and Edge, Firefox is getting…Firefox 112.0.2 fixes high memory usage, broken…