For those of you who wear aluminum foil hats, the voices lie, don't believe them!
Mostly my replies are about Windows OS. If not I try to remember to specify Linux.
What I see is right-click opening the context menu, and Command-right-click does the same thing. I use a Mac, so Command does almost the same job as Control does with Windows or Linux. To close a tab, I usually middle-click it. Command-left-click is the same as just left-click with any browser except Vivaldi.
It is interesting that Cmd-left-click on a tab with Vivaldi draws an outline of dashes around it.