woothemes/FlexSlider — pull request #998 by dulldave (2014-01-22 21:06:35+00:00)
Title: Flexslider.css Firefox negative margin bug

In the latest Firefox if you're using negative margins on '.flexslider', plus a positive bottom margin it cause flexslider to move down by whatever value is giving on the bottom margin. Changing the content value to a period fixes this and causes no harm to other browsers.