Firefox 6.0 doesn't open pdf-links after clicking on "open pdf". I frequently need to do literature searches and I need to view pdf files in the browser. After clicking on the pdf - link of a file the main options are to open or download the pdf. Every time I try to open a pdf-file a blank page and an error message appears saying the file would not be supported or is damaged. IE, however, opens the file all right. I tried various changes in the security and cookie settings without success. Please advice.