That reports that Online magazine heise. The performance problems first appeared in 2018 with Firefox users who use Defender and were therefore still using Windows 10 at the time. The reports were very similar – you could always read about performance losses that were clearly noticeable.
The Mozilla developers found the cause to be that Defender didn’t work particularly well with Firefox – as soon as Firefox was started, Defender was particularly active and, according to the task manager, needed 30 percent or more of the processor’s performance. This slowed down Firefox.
Microsoft definition update fixes the problem
This annoyance has now dragged on for years, and even switching to Windows 11 hardly brought any change in behavior. According to heise, however, Microsoft has now created the solution to the problem in one of the regular definition updates. The definition update is equally available for all OS versions. In the Mozilla Forum wrote a user: “According to Microsoft, this will be made available to all users as part of regular definition updates that are packaged independently of OS updates. This even includes users of Windows 7 and 8.1, although these platforms don’t even experience the performance issue with Firefox should have in the first place because the ETW events that cause it don’t exist on those older versions of Windows, so as far as I know only users who explicitly decline definition updates (which doesn’t sound like a viable solution for your AV) get , not the fix.”
Once the update has been installed, Firefox users should notice the improvement in their everyday lives.
- Mozilla reports performance problems under Windows 10 and Windows 11 as resolved after 5 years.
- Cause was bad cooperation between Firefox & Defender.
- Problems known since 2018, switching to Windows 11 brought no change.
- Microsoft solved the problem in a definition update.
- This is available for all OS versions.
- Users who opt out of definition updates will not receive the fix.
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