This is a bug that only affects to some users, personally I'm not getting it in my system and FF ins my main browser... as You can see, in this new patches for K2017 & K2018 will come the fix for it also...
I don't have macOS systems so I can't help You... that temporal workaround is ok until They fix it, but better to report and contact to KL Support to make pressing: https://center.kaspersky.com
V.19 still is a beta, when You install it application traces are enabled, and also some other debugging features such as app. & driver verifications, that can be disabled and deleting some Windows Registry keys, this beta is quite stable in my system, but probably still not optimized
So sorry but I can't say... I'm beta testing but Windows Home Products, don't know about macOS, You better ask to KL Support, but probably They won't know either...
Patch for this issue was already released for Windows versions K2017 and K2018...
If you can say about this problem on kaspersky forum will be amazing or some mac moderator from Kaspersky to come and look at this post. On windows I don't had any problem but on mac is a complet different story. thanks