I have tried to upgrade to 5.0 and, most recently, to 6.0. But I end up having to downgrade to 3.6 because I am not able to print from either 5.0 or 6.0. When I click on 'print preview' or 'print,' nothing at all happens. No print preview screen nor print dialogue box. I really wish this problem could be fixed. I won't be able to keep using firefox if I can't print web pages. If there is a fix for this, please let me know. Thanks.