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Re:Firefox 22 released by masklinn on Wednesday June 26, 2013 @12:31PM (#5947044)
It might be restricted to focusable/editable components, e.g. a `contenteditable` block should work.
Re:Firefox 22 released by aaronm67 on Wednesday June 26, 2013 @01:57PM (#5947705)
Yep, you're correct

http://jsbin.com/odupog/1/edit

Either way, should alleviate some of the privacy concerns, as you can only get ClipboardData from elements where "paste" has a visible effect.