Firefox 4.0.1 Plug-in PDF missing

I just upgraded my Firefox to 4.0.1 on my Mac.
Now when I click on a link that should open a PDF, it instead downloads it to my desktop.
I looked in PREFERENCES and PLUGINS but I don't see any PDF listed.
Where is it?
Thanks for your help.
Rick Black
El Paso Texas

I fixed this, in a fairly brutal way. Here is the solution.
Save your bookmarks, like on the desktop. Or you could launch Safari and import your Firefox bookmarks into Safari, then later pull them back into Firefox.
COMPLETELY delete everything that has to do with Firefox. That includes not only the application, any dmg file hanging around and most importantly the ENTIRE contents of User/Library/ApplicationSupport/Firefox. Indeed just throw the whole Firefox folder in the Trash. Empty the Trash just in case. Now use Safari to download a new Firefox.dmg file and start from scratch. You will have to re-establish your Preferences. But Firefox will not hang, and most importantly, it will not hang your OS. --Gene

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