One of our top contributors is so old school that he uses Firefox 12. He reported that infoboxes (the new ones, with tags specs and not just tables or other templates) are incorrectly displayed there, and I've checked - he's right, example: http://imgur.com/g12D5UH As you can see, the left column of the infobox is too narrow and in general positioning of elements is all over the place.
Whom do I contact to fix this and/or add support for FF12? I know it's not the most recent browser, but it's not that old either - released just a year or so ago.