Opening pdf in Firefox

Ok...so my wife's a scrapbooker and opens alot of PDF's online via FireFox to view designs. Last night she clicks on a link to open a pdf and for some reason chose to save it rather than open it. And then she selected to "Do this automatically for files like this from now on". Well, that was a mistake. Now when we click on links to open pdf's (and other file types, I presume) it always prompts us to save the file and does not give us the chance to open it. How in the world do I go back to opening rather than saving? I've used Finder, found a local pdf file, set things up to always use Adobe Reader to open pdf files but that doesn't do the trick.
HELP! PLEASE!
Thanks!
Jim

Here's the answer, provided by a teacher friend that works with my wife:
Make sure you have closed Firefox
Go to Hard drive click on the house that has your name by it
Click on Library
Click on Application Support
Click on Firefox folder
Click on profiles folder
Click on iiosuk5g.default folder
Find the mimeType.rdf file
Drag it to the trash (It regenerates itself when you
relaunch Firefox)
Relaunch Firefox
It should now be reset.

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Header 1
Header 2
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