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When hovering this link here, lines start to jump.
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Also resizing the Window makes the lines jump.
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This problem is present with any odd number of lines where -moz-column-width is in use.
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And this is therefor a really annoying and hard to use link.
Tested with Firefox 33 and Firefox nightly 36 on Windows 7 x64.
And validated by the W3C Validator.