I've been using the Firefox plug-in Ghostery for some time now to prevent web-tracking scripts, except when there was a buggy release that prevented Firefox from closing down cleanly.  I just upgraded Ubuntu GNU/Linux to 10.04 (Lucid Lynx), and as ever, the process was pretty much flawless.  The upgrade brought with it a newer version of Firefox (3.6.3), and when I started it, a few updated plugins were installed, including Ghostery 2.1. It seems however that Ghostery 2.1 might not be playing ball with a couple of websites.  In my work Outlook web access, all links (e.g. to open mail messages) are dead.  And FaceBook gives blank pages (no bad thing, one might think!  Disabling Ghostery brings back functionality to both sites.