Yes, you can. I just did it to verify. Keep in mind, I have Tabbrowser Extensions installed, so I can't say if this is enabled by default, or if TB enabled it. But it's there, one way or the other.
Thanks. This thread may yet pull me away from Opera, to an 'mericun browser. Opera 7.50 is very handy, though. An improvement I would look, is a more robust use of java (sometimes in Opera, it just doesn't work quite as well as Mozilla or IE).
What makes the vanilla Mozilla suite very handy for me is the ability to cut presented HTML and paste into Composer. Very nice for clipping items into FR, for one thing!