@leocg I didn't. I've unchecked it now and it is working as I've expected. I didn't know about this setting. Maybe it shouldn't be checked as default? It is confusing. Thanks for your help.

Key shortcuts for moving between tabs doesn't work as expected: 'shift + ctrl + tab' and 'ctrl + tab'. I press these keys quickly, I don't hold one and press another (I've mapped shortcuts to my mouse additional keys) It switches between totally random tabs but I expect it should switch between tabs next to one another in one context. I have 5 contexts with about 20 tabs each. In another chromium based web browsers these shortcuts works ok.