Maybe somewhat late as many users already got the update automatically, but better late than never.
PrefBar 6.2 is available and brings the following important updates:* The PrefBar context menu now contains an "Edit button" entry, which allows to edit buttons without going over "Customize PrefBar". * Proxy Serverlist now supports IPv6 addresses, if they are enclosed in square brackets. * The Button editor now contains an "Apply" button to save changes without leaving the dialog. * It is now possible to jump to source view from error console, if your button caused an exception. * You no longer have to set an ID for "spacer" or "separator" items. If you click on "New" -> "Spacer"/"Separator", then the item is created immediately using an anonymous unique ID. * about:config integration, which allows you to enter the button editor directly from the about:config context menu.
For a full list of changes, please have a look at the ChangeLog (http://prefbar.tuxfamily.org/help/newstuff.html#v6.2)