When I click the "quick launch" button (or whatever KDE calls them) to open a web browser, I like to have a new top-level window, not a tab of an existing browser window.
Opera, by default, creates a new tab in an existing window. So, I hunted for a command line option to force it to create a new window. Here are the command line options:
Sure enough, there's a
-newwindow option to create a new window. I try it, and what does it do?
It creates a new tab in an existing window.