We have had a couple of reports of issues with this latest update of Firefox to version 30.0.
The first issue is that the Print button "action", starting in Firefox version 29, differs from previous versions in that it now opens Print Preview rather than going directly to the "native print dialog" box. Mozilla has this problem listed as a known bug, so they are aware of it. This does not affect when you print from either the File menu or if you do a Ctrl+P. It only happens if you have added the Print button to your toolbar. So if you are using the Print button in the toolbar then you will have an extra step in order to print out the web page.
The second issue is with the PDF viewer that is built into Firefox. It now opens PDFs with the built-in PDF viewer instead of the Adobe Reader plugin, and the built-in PDF viewer does not handle relative links properly. ("Relative links" meaning: the link URLs start with "somefolder/somefile.pdf" instead of "http://www..." which is common in an HTML page, but less so in a PDF.) This issue is considered a bug, but has not been fixed yet.
If you run across any other issues please call the Help Desk and report them.