Please create new threads for separate issues.
In any case, you also need to follow the same advice I gave in the other thread
Any time an application in Plasma crashes, and Dr Konqui appears, you should use the Developer Information (backtrace) in it to file a bug with KDE at https://bugs.kde.org
You'll need to install devel packages to get a good backtrace (and see less lines with ?? in the Developer Information). For more information, see
https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports#Retrieving_a_backtrace_using_coredumpctl?
This crash is an upstream KDE Plasma issue since it is not related to how we package Plasma. The crash is in the plasma-browser-integration-host which is developed by KDE.