Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9a9pre) Gecko/2007110405 Minefield/3.0a9pre
In the bookmarks sidebar, middle-clicking a bookmarks folder doesn't open the bookmarks in tabs (it doesn't open anything).
In Firefox 2.0.0.*, it opens them.
Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9a9pre) Gecko/2007110405 Minefield/3.0a9pre
In the bookmarks sidebar, middle-clicking a bookmarks folder doesn't open the bookmarks in tabs (it doesn't open anything).
In Firefox 2.0.0.*, it opens them.