We have received this update from Ebsco Technical Support:
We sincerely apologize for the inconvenience of eBook
PDFs not loading in Firefox 45 and above. This issue is a result of an update
to the Firefox code base which is incompatible with our eBook viewer. We are
working to fully resolve this issue as soon as possible and in the meantime
have implemented a fix that has restored access to eBook PDFs in Firefox. A
byproduct of this fix is loss of page-to-page vertical scrolling for eBooks in
Firefox, though all other navigation options remain available: table of
contents links, page back and forward arrows, and entering a page number into
the page number box.
So be sure to use the page arrows at the center bottom instead of the scroll bars.
