Page example where green box shows odd line at the bottom in Firefox 4.x on OSX: http://www.workcycles.com/home-products/custom-special-bikes/monark-long-john-transport-bicycle
On the indicated page and several other pages where this green information box is with rounded corners div.greenBoxWBSmallDown gets a white line at the top. When padding:0; is commented out it disappears. This line only appears in firefox 3.6+ and not in Firefox 3.6+ on other operating systems. Only on my Mac using FF 3 or 4.
When there are no thumbnails the white line does not appear in the green information box. The link has a page with a main image and thumbnails. Do not know if this is significant, but decided to mention it.
How to remove the line without causing issues in Firefox on other OS and in all other browsers?
NB Bug report filed here https://bugzilla.mozilla.org/show_bug.cgi?id=655213
, but no replies had as of yet.