[Bug 239926]

[Gavin Sharp]

Comment on attachment 524711
Proposed, exceedingly simple patch

Rather than doing this, I'd just remove the "button" attribute on the
existing handler in favor of code that checks (event.button == 0 ||
event.button == 1).

But I'm not sure it makes sense to do this at all, it doesn't seem like
a common or discoverable UI behavior. Do any other dropdown lists behave
this way on any platform or in other browsers?

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https://bugs.launchpad.net/bugs/239926

Title:
  middle button to open a new tab