Hittade nedanstående på Macworld, tydligen funkar Shubert plugin endast på PowerPC och inte på Intelbaserade Mac'ar.
Ni som får det att funka har ni PowerPC eller Intel ?
"Mozilla’s Firefox (free) Web browser doesn’t offer PDF viewing in the browser window by default. When you click on a PDF browser link, Firefox pops up a dialog box that offers you the option to open the file with your Mac’s default PDF viewer or save the file.
AdobePDFViewer.plugin isn’t compatible with Firefox, but if you’re using a PowerPC-based Mac, you have other options. Shubert|it provides the first option, the free PDF Browser Plugin (4.5 mice). With this plug-in installed in your Internet Plug-Ins folder, you have the same inline PDF viewing options that Safari offers (although they’re available in a toolbar rather than a contextual menu), plus the ability to rotate pages and view facing pages.
As this article went to press, PDF Browser Plugin wasn’t compatible with Intel Macs. If you want to view a PDF inside Firefox on an Intel Mac, turn to Denis Remondini’s free PDF Download extension. It can display a PDF file as HTML within a browser window, but offers no special navigation or viewing features."