I am experiencing the same issue. Kaspersky Protection 2.4.33.0 is continuously using massive amounts of CPU resource. I am using Firefox latest version (112.0.2). Previous version of KP did not have this problem. I have found this problem on more than one PC, so this is not an isolated case! Other people have also reported the same issue. I have had to disable KP as it was making browsing extremely sluggish.