Try this: log in to your yahoo mail then go to CONTACTS then TOOLS then PRINT then choose YOUR ENTIRE ADDRESS BOOK or choose ALL in CATEGORY then tick in Lay out session the DETAILED VIEW and then click the DISPLAY FOR PRINTING button. As soon as you click the Display for Printing button, Yahoo Mail will directly launch a PDF file, which you can Open or Save. (We recommend that you save the file first, since if you open first, the file is stored in your temporary internet files.). The PDF file Yahoo Mail generates will be called "yab.pdf", which stands for "Yahoo Address Book". IF the option OPEN or SAVE the file does not exist, but you can see the contacts, go to FILE(up left in the firefox page), choose PRINT and OK to print your contacts. tell us if this work for you. thank you.