@mcol Did anybody else observe them in xorg, also?
I thought it would be me clicking in the wrong place or not clicking (pressing the mouse button) at all. But I'm getting the feeling it might be the software and by feeling I'd say it started with the last firefox update.
@chrichri I have seen recent bug reports under X where for some mysterious reason the right click menu appears above the cursor. Like, above, in the Z axis... so clicks go onto the main window. I don't even know how that's possible under X???? Super weird.