overflow: auto on list items. When an li element is set to overflow: auto Firefox creates a horizontal scroll bar in most cases. Short entries not containing block level tags don’t suffer from this problem

The css for the two lists below are 

#content ul.publications li
{
  overflow: auto ;
}

#content ul.demo li div
{
  overflow: auto ;
}

The first list has overflow auto applied to the list items. The bug seems to need the entry to be quite long, or to contain a block level element like p or an heading as demonstrated by the hello world lines below.

The second list below it overflow auto is applied to a dive that wraps the li’s content.

List 1

List 2

Below the overflow is applied to a div insted of a list item

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