... and probably others. Not sure this is an Opera problem specifically, but that's my browser.
Amazon has started a drop-down from the title bar, full width, offering a "1 button app." The drop-down can be closed, but it comes back again. Adblock doesn't touch it. Can you think of a way to kill it?
I can't add anything substantional, but I have seen these things on amazon - but for now these are disappeared. I just checked on different amazon sites (com/uk/de), some logged in, some not - neither of these didn't show this 'offer' to me. (I disabled both Adblock and Ghostery - no difference.) Opera dev version here.