Bug 695222 added support for -moz-column-fill, with the spec's default that we don't want of balance, so that when we have more than one column worth of scrape, instead of the previous "fill the first column, overflow to the second" we get two lines in the first column, two lines in the second, one line in the third. For some as yet unclear reason, bug 715203 means that we don't get what we should from -moz-column-fill: auto, but we should put it in anyway, to be ready for when we do get what we want.