For some reason when enabling Restore manually saved session in Desktop Session Login and Logout settings, and hitting Save Session from the applications menu - all opened application windows get saved and restored upon login into the KDE session, except google chrome.
I located the session file ~/.config/ksmserverrc and indeed firefox and many other applications are there:
$ grep firefox ~/.config/ksmserverrc
program11=firefox
restartCommand11=/usr/bin/firefox,--sm-client-id,10686f70[...]
$ grep gkrellm ~/.config/ksmserverrc
program12=/usr/bin/gkrellm
restartCommand12=/usr/bin/gkrellm,--sm-client-id,10686f70[...]
$ grep chrome ~/.config/ksmserverrc
as you can see chrome is not there.
And no application has been configured to be excluded:
$ grep excludeApps ~/.config/ksmserverrc
excludeApps=
The only unusual thing about chrome, as compared to other applications, perhaps, is that it appears as many threads in the output of ps(1).
I have it installed as:
$ sudo apt-get install google-chrome-stable
google-chrome-stable is already the newest version (69.0.3497.100-1)
My setup: Kubuntu 18.04, Plasma 5.12.6, KDE Frameworks 5.44
