Can't Open PDFs Inside Firefox

I have installed the latest Adobe Reader 9 and want to open PDF documents inside of the Firefox browser on Vista. No matter what I do, I always get a popup window asking me if I want to download or open in Adobe Reader when I click on a pdf file. I have Firefox's tools - options - applications set to "use Adobe Acrobat (in Firefox)". I have re-installed Adobe Reader and Firefox with the most recent versions. I have manually copied the plugin dll from its Adobe directory to the Firefox directory, over-writing the existing one in Firefox. I have deleted pluginreg.dat and let Firefox recreate it. None of this does anything for me. My IE, however, will open PDF files inline with Adobe Reader. Any ideas?

I have the same problem, after installing Adobe Reader Ver 9.4.0. Using FF Ver 3.6.12 and XP home edition. Prior to this last Adobe installation, I could always download PDF documents from the Internet. But now, when I try to download, I first get an all white page for a second or two and then the page goes all black and nothing happens after that. Have tried it many times, and always get the same result.
I can still open PDFs from those stored on my Hard Drive OK, but I can no longer open or download any PDF from the Internet.
Has to be a defect in the latest Adobe version. Is there any fix for this?
Thanks,
ASC

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Can't Open PDFs Inside Firefox

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