Safari & Firefox behaving badly when viewing pdf files

Since upgrading my Mac to Lion, Safari and Firefox have not displayed pdf files for viewing.
SAFARI: When I click a pdf link in Safari, a dark grey blank page appears. When I try to save the pdf file to my desktop, an error message says the file is not properly formatted.
FIREFOX: When I click a pdf link in Firefox, a white blank page appears. I can successfully save the file to my desktop, and in turn open the file using Acrobat.
CHROME: Everything works normally...no problems found when viewing pdf files.
I tried dumping the plist file for both Safari and Firefox, and resetting both browsers clearing them of cache, etc., but none of that worked.
Has anyone else seen similar behavior? Anyone have a solution?
I have posted this problem twice in Apple's Safari Forum, but have had no response in almost two months.
Thanks

In Safari you to have the Acrobat PDFviewer plugin installed, or the The PDFBrowser plugin by Schubert of Germany Installed.
If you use the PDFBrowser Plugin you need the 2.4.2 version in order to work with the version 5.1 of Safari and 2.2.3 version for Safari 5.05 and lower.
In FireFox version 3.6.X and lower you need version of the PDFBrowser Plugin version 2.2.3 which also works with Safari 5.05 and lower. And version 2.4.2 for Safari 5.1 and above and FF 4.0 and above, and Seamonkey version 2.3 and above.
THE ADOBE PDFVIEWER PLUGIN has only worked with OSX for Safari. Adobe quit supporting any other browsers on the Macintosh with the roll out of OSX years ago except for Safari. And despite repeated request by many users, its gone on deaf ears.
As a result This Schubert fellow from Germany has had to fill the void. It works on "any" browser on the Market for Mac. And works for any browser for Windows except Internet Explorer.
The only thing it doesn't do is online forms which the Acrobat Plugin will. But since it only works with Safari its Useless. I'm not going to Crank up Safari just to fill in Forms.
Oh, you use to be able to install both plugins and would work fine. Now if both are installed neither works. Its either use the one that works on one Web Browser and allows form filling.
Or use the one that works on everything, but can't do forms. Oh Schubert on his Web site explains his is forbidden from installing support for forms.

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