<p><a href="https://github.com/tomhughes" class="user-mention">@tomhughes</a> FF30 <a href="https://www.mozilla.org/en-US/firefox/30.0beta/releasenotes/">allowed the use</a> of <code>line-height</code> for <code><input type="reset|button|submit"></code>. If the <code>line-height</code> value is greater than the value of the <code>font-size</code> for the element, this difference is cut in half and distributed evenly on the top and bottom of the in-line box.</p>

<p>Using value of <code>$typeheight</code> into <code>$lineheight</code> apparently the problem is solved.</p>

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