When I open Firefox (with Google as home page), I get prompted to save a file (application/octet-stream)

This is my mother's computer. It's an HP Pro something. It has Win 7 Pro and Firefox is up to date. I'm not sure when this started because she doesn't use it every day. We can't get to Google at all using Firefox. I even tried a new tab just now and I get prompted to save a file (earlier the file it is prompting to save is NFRC_FLE13007-1A-RD_3300_SN_CIG_IS20_i89.pdf [the two dashes might be underscores - can't read my own writing!] Now it doesn't show me the file name). I tried using bing to search for this file name and didn't get any results.
I already tried clearing the cache and also resetting the browser using CTRL-F5. I've rebooted after that too. No changes...
I have not cleared cookies - I think she relies on a lot of them and I don't want to get her more confused!
Also, I've set up a number of "shortcuts" on her desktop so she can go directly to some websites. One is for Yahoo, one is for WebMD, etc. When I click on these, I do not have the issue. Seems to be related only to Google. Okay, just tried Google Maps and the same thing happens... And same thing happens with GMail. I captured the window, see the attachments..
Thanks!
p.s. I occasionally (on my computer) get prompted to save a file in Firefox when I hit the back button. I just say cancel and then do it again and everything is fine. I don't know if this is related either. I have Win 8.1 on a Lenovo laptop.

Try to boot the computer in [http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-7 Windows Safe Mode with network support] (press F8 on the boot screen) open firefox and see if that happens again.

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