U of C picked up a subscription to ebrary a couple of months ago and at that time the ebrary reader (necessary to actually view the books) didn’t really work with Mozilla or Firefox. It could be done, but you had to manually add something to the registry, which is not very nice to ask your patrons to do. Just learned that they have a new version of the reader that works with the following:
Web browsers Netscape Communicator 4.x, 7.1 and above (not currently supporting Netscape 6.x or 7.0)
Microsoft Internet Explorer 4.x through 6.x
Mozilla 1.7 and above
Firefox 1.0 and aboveLink: ebrary Software Download Page.