This is an oldie but a goodie. In Safari there’s only so much room on the Bookmarks bar, but instead of writing shorter and more confusing names in order to fit more in, you can use a font trick to display meaningful little dingbats for your Bookmarks instead. For details, check out the tutorial on the Unofficial Apple Weblog.
Personally I have 13 folders on the bar and 7 of them have a little dingbat to replace their folder names. Quite handy indeed
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